Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b5bc5fc878a06c…

MALICIOUS

PDF

50.9 KB Created: 2020-07-22 07:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: d9d5bb1e7fb0a174040063bc42526277 SHA-1: eb4473ca26958647db9f18fc56029951882a8f64 SHA-256: 81b5bc5fc878a06c891e9ad8f3089b570bd5f720ee23edb6787df28a208190dc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDFs, many of which are hosted on Shopify and appear to be part of an SEO link farm designed to attract users searching for specific manuals. The primary redirector URL, https://ttraff.com/wb?keyword=hill%20rom%20isolette%20c2000%20service%20manual, suggests a lure related to a specific service manual. The ML classifier strongly indicates maliciousness, and the presence of redirector links points towards a phishing or malware distribution scheme.

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.com/wb?keyword=hill%20rom%20isolette%20c2000%20service%20manual In PDF document text
    • http://files.granbytroop125.org/uploads/1/3/1/3/131398574/4de25464dcd.pdfIn PDF document text
    • http://files.dynoprotech.com/uploads/1/3/0/9/130969242/givanimimo-basupepizebes-nefamukidu.pdfIn PDF document text
    • http://files.octreeconsulting.com/uploads/1/3/0/7/130776483/6898513.pdfIn PDF document text
    • http://files.basementcityproductions.com/uploads/1/3/0/9/130969896/2490830.pdfIn PDF document text
    • http://files.singplayaudiate.com/uploads/1/3/2/6/132681144/f6d57c55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/jadixopuporuwowow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/79035629461.pdfIn PDF document text
    • https://ziwamol.files.wordpress.com/2020/07/96110654906.pdfIn PDF document text
    • https://penigan.files.wordpress.com/2020/07/34338757179.pdfIn PDF document text
    • https://nibenig.files.wordpress.com/2020/06/37336969391.pdfIn PDF document text
    • https://bamidepe.files.wordpress.com/2020/07/vanar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/39080467929.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/velokiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/retudovozika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/kinunebadijizelep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/5451315861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/48132039648.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/foremokilunukojogorigo.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_off00007c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1D 5124 bytes
SHA-256: 2c57c3c453ad66de02dee23ff6eea54509a0d1b27a4929b13a10af7b3d3e5fb9
font_01_sfnt_off00008d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D62 14832 bytes
SHA-256: 6015d63270a6cda9046f09a859499c23b0de6fab09f12a7d46052dcb9193f076