Malicious PDF — malware analysis report

Static analysis result for SHA-256 9752fa368975697f…

MALICIOUS

PDF

35.6 KB Created: 2020-07-09 23:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: bb0dce02bb6b414c8f9e16db16841311 SHA-1: b565c2553dc1739dcb92f96677f3673d6e062698 SHA-256: 9752fa368975697f7cc816c06504ed21342328a649b7963f4f8f990a770bdb7e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF document contains a large number of embedded links, many of which point to redirector infrastructure. The primary link, 'https://ttraff.cc/wb?keyword=physical%20properties%20of%20matter%20worksheet%20grade%205', is designed to lure the user into clicking by appearing as an educational resource. The heuristic firings confirm the presence of malicious redirectors and a link farm, indicating a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=physical%20properties%20of%20matter%20worksheet%20grade%205 In PDF document text
    • http://files.haywardfitnessfanatics.com/uploads/1/3/0/8/130874413/dugen.pdfIn PDF document text
    • http://files.marizageorgalou.com/uploads/1/3/1/3/131378816/weben.pdfIn PDF document text
    • http://files.bankleysplumbinginc.com/uploads/1/3/1/4/131437699/buwowidemo.pdfIn PDF document text
    • http://files.wbparks.org/uploads/1/3/2/6/132695569/bedamufevetir.pdfIn PDF document text
    • http://files.creeksideband.com/uploads/1/3/1/3/131384789/3301404.pdfIn PDF document text
    • http://files.mrsararadian.com/uploads/1/3/1/4/131453676/725d0ad5d8b20d.pdfIn PDF document text
    • http://files.thewordwashing.com/uploads/1/3/1/3/131381640/pemevavuxagarig.pdfIn PDF document text
    • http://files.nducuwangugi.com/uploads/1/3/0/9/130969555/gimuviri-megatanizus-selusifo.pdfIn PDF document text
    • http://files.yorkiesbydesignllc.com/uploads/1/3/1/4/131406295/nowunewobam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dakisil.files.wordpress.com/2020/06/54637999682.pdfIn PDF document text
    • https://kolurinitof.files.wordpress.com/2020/07/xewakenowebik.pdfIn PDF document text
    • https://wunugevakel.files.wordpress.com/2020/06/37341579894.pdfIn PDF document text
    • https://gekaromob.files.wordpress.com/2020/06/rafogejamufojoretogo.pdfIn PDF document text
    • https://vanuvawak.files.wordpress.com/2020/07/35614429183.pdfIn PDF document text
    • https://daletezafij.files.wordpress.com/2020/07/bimeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27039997465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xirapekewovefosisukepeja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xawifakupubegezixezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35679391278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E2D 5636 bytes
SHA-256: 9eef0daa8532851720ef08f8ae14c21d771c32c426debe229876f743bf6ae649
font_01_sfnt_off00006172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6172 9312 bytes
SHA-256: 81eeffa400987d9e5047feb8105a0284c209960857e4626480b1abc8cd652ecb