Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63baa8af88345b7…

MALICIOUS

PDF

41.9 KB Created: 2020-07-12 02:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 3ea9567bb7fd5897139904340de3ff0b SHA-1: 49ea37b02e540874ff52215808a88bdd6ce35b10 SHA-256: a63baa8af88345b726b64e8f64c848edb76fdd9bff553d4cbe68c48b3a054c79
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to domains that host further PDF files. One prominent link directs to 'ttraff.com', a known malicious redirector. The document body, though heavily obfuscated, contains text related to factoring trinomials and includes the malicious URL, suggesting a lure to trick users into visiting a malicious site. The presence of a link farm and a malicious redirector indicates a campaign focused on driving traffic to potentially harmful content.

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=factoring%20trinomials%20worksheet%20algebra%202%20answers In PDF document text
    • http://files.norcalsmartvestorpro.com/uploads/1/3/2/7/132710655/96f0fa3.pdfIn PDF document text
    • http://files.maumeebaycarvers.com/uploads/1/3/1/1/131163561/1948891.pdfIn PDF document text
    • http://files.kriti-jain.com/uploads/1/3/0/7/130775837/1aba70.pdfIn PDF document text
    • http://files.alllittlerockstars.com/uploads/1/3/0/7/130738881/zuzilalakoli.pdfIn PDF document text
    • http://files.absolutepartydjs.com/uploads/1/3/0/7/130775834/bezuroku-ruzinakitaziki-kemora-viporilugefiw.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/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38970143778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1724/0733/files/89777690181.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/ripoguwasenexozuno.pdfIn PDF document text
    • https://fajadofavano.files.wordpress.com/2020/06/favizitam.pdfIn PDF document text
    • https://perukawapowe.files.wordpress.com/2020/06/36436217894.pdfIn PDF document text
    • https://zolibuvove523289473.files.wordpress.com/2020/06/98006782788.pdfIn PDF document text
    • https://wogeberej.files.wordpress.com/2020/06/butojalakim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/lubejidafagiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56655156305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7727/1706/files/26935438800.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/58322740709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/11219125703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/67033183714.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_off00006647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6647 5384 bytes
SHA-256: 6e037ee2c57b4cb4e2ee725023141c4d18d683b75daf30c79402d6f723312772
font_01_sfnt_off00007876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7876 9884 bytes
SHA-256: 282e16bb6e5abf37cec183ced4cbba3ed1dc4eba05a88158f026ad5a9dc5e48b