Malicious PDF — malware analysis report

Static analysis result for SHA-256 1739137276a6d438…

MALICIOUS

PDF

39.1 KB Created: 2020-07-26 23:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8176a6c93da63c3bb04d18f98d34bce SHA-1: c8ec4ac76d5f989297f4e52ce1eddd0a57016e16 SHA-256: 1739137276a6d43849b87e7ed304c93774620181aaa53687b6f92be2643df3de
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to lure the user to external, potentially malicious, content. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=macromolecule+chart+answers
    • http://files.saratogadiwali.org/uploads/1/3/0/9/130969080/8021349.pdf
    • http://files.opalaneboutique.com/uploads/1/3/0/8/130815124/1113111.pdf
    • http://files.madephotobooths.com/uploads/1/3/2/7/132740399/60ecb4e8fb.pdf
    • http://files.northpointcg.com/uploads/1/3/0/7/130775232/dc5317d66328b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/91030871527.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2156/files/bezifinanavolefev.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/mubewari.pdf
    • https://cdn.shopify.com/s/files/1/0434/7265/0397/files/21310554100.pdf
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/bobitidom.pdf
    • https://cdn.shopify.com/s/files/1/0428/8164/6758/files/lawawajizuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/26953007150.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/disajap.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/xinisetawi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/97410314157.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d79.bin
573f398fc82caac9eeb7e9987660353ff9f424280dc0bc1ef97e5c4087ca4183
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D79 4972 bytes
font_01_sfnt_off00006e46.bin
885e6573957757770300ec520da14d3811d640431b619b2769b141100125026e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E46 9768 bytes