Malicious PDF — malware analysis report

Static analysis result for SHA-256 625cb7ae3de3a2c7…

MALICIOUS

PDF

68.5 KB Created: 2020-08-07 06:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 597443f666e0e9ef21d3a2380efb2f97 SHA-1: e29d97c5ce59ac0b50969493307ee617a62baf25 SHA-256: 625cb7ae3de3a2c7ba381dfedbbda45d19c1b08373b66d2f533fafb07c04390f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.com/pify?keyword=statistical+inference+theory+of+estimation+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links further supports the classification as a link farm, likely used for SEO manipulation or to host further malicious content.

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=statistical+inference+theory+of+estimation+pdf
    • http://files.slra.org/uploads/1/3/2/6/132682134/9397687.pdf
    • http://files.thoughtsfromthepaint.com/uploads/1/3/2/6/132682076/8225074.pdf
    • http://zinuvonir.laptopupcycle.org/uploads/1/3/1/6/131606758/2683263.pdf
    • http://fisifuf.withinyourmeansdesign.com/uploads/1/3/0/7/130739826/f6b87a1581c.pdf
    • http://jujaru.philbg.ca/uploads/1/3/1/8/131856772/84485d2bcea7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/midupolunutaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/45355441385.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/kubernetes_on_coreos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/najimuwugawijuzex.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/vegawomiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/borutazaweluv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/practical_skills_in_chemistry_john_dean.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/bon_iver_skinny_love_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/sulifiwowirepizogulivekun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0366/5822/files/64823952725.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa51.bin
8fc8014bc8f5d9efe2129ab6a7eb21fa856efa1ed272a87d414d8d18cc6a6229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA51 5388 bytes
font_01_sfnt_off0000bc65.bin
c1b5b96fedbb91faaa7d22ff895e16dc7d6fb7e249bb9b3d06f3f45c3de5ff8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC65 10932 bytes
font_02_sfnt_off0000e1cb.bin
1513cff1140ee46b119fd1f1a8d89226c35fa745519edd36504e398b791a408b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 16084 bytes
font_03_sfnt_off0000f676.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 4324 bytes

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