Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd4ddfae109d164…

MALICIOUS

PDF

44.6 KB Created: 2020-08-06 22:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f140b53fe0f89ec903597d0cc16bef SHA-1: 935e2ae5ef8311962577aff88d479d7cff16c69b SHA-256: 6bd4ddfae109d16479225fb44e1fbc5b4e787ac5aa6ead426039994d0815fc89
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=partnership+goodwill+accounting+treatment+pdf', which is likely used to redirect the user to malicious content. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=partnership+goodwill+accounting+treatment+pdf
    • http://files.australiande.com/uploads/1/3/1/4/131437313/dovabi.pdf
    • http://navudiga.ericashanechildbirth.com/uploads/1/3/1/4/131453194/zugovolegodove.pdf
    • http://files.uublaine.org/uploads/1/3/0/8/130874544/tunusukijugow_mamowazebe_sepaxamawewupek.pdf
    • http://files.mcgrathirishdancers.com/uploads/1/3/1/1/131164310/25e67bf116bd907.pdf
    • http://files.fracturedpottery.com/uploads/1/3/0/8/130874029/3a175a79d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0614/8255/files/defulurajuvosalamop.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/97591861011.pdf
    • https://cdn.shopify.com/s/files/1/0431/9277/8901/files/94814333293.pdf
    • https://cdn.shopify.com/s/files/1/0439/0662/9784/files/xuninitevejoxidetobameso.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7985/files/levurokodim.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/41120767464.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/rajigalesapul.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/tawefazodatabazego.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/laboratory_glasswares_and_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/gozawiwajoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/69574190420.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_off00006e96.bin
eeb0ddc928206903ac6424f2569a6ffdd02acdf85ddc9e51300faa9716cc6193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E96 5664 bytes
font_01_sfnt_off000081c6.bin
2611f8a72e4838b1c88444ca873b185157dd4ab54d32f22bd9180cf2ea02fe76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C6 10420 bytes

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