Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcb4cee3f51c26d…

MALICIOUS

PDF

45.9 KB Created: 2020-08-04 11:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ae6da9853403f8b4e71f2f8fb5936ee SHA-1: 7551e4be50b0228ff9b4eb9ac33cbd7b65a1f2d5 SHA-256: 6dcb4cee3f51c26d5547b474ebbff932d9cdccd0d72cc3f641c4186336b8b5ac
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO link farming or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=generos+literarios+de+la+edad+media+pdf`. The document body, though heavily obfuscated, contains references to the same URL, suggesting an attempt to disguise malicious activity. 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.ru/pify?keyword=generos+literarios+de+la+edad+media+pdf
    • http://files.kimschlagfitness.com/uploads/1/3/0/9/130969242/5376179.pdf
    • http://files.sgshinekids.com/uploads/1/3/0/9/130969740/sopikuxi_monileve_zelareni.pdf
    • http://musuxafeg.fitnessaddictny.com/uploads/1/3/1/8/131871864/0f58b20dc74e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/65558471531.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/10173096204.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/fabimojekake.pdf
    • https://cdn.shopify.com/s/files/1/0428/6090/4615/files/mexaranolup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84407481133.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/skin_creator_for_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0562/files/37244680717.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/duxokifofarijizetud.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/rainbow_frog_meme.pdf
    • https://cdn.shopify.com/s/files/1/0435/8412/7135/files/7008505774.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/notes_page.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/gowatadebajosefa.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_off000073e3.bin
e7fc62fae2e8ab97e29434c6e0a100e9ccd11300beb331ab80a1a9feb26b4ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E3 5220 bytes
font_01_sfnt_off0000858e.bin
3494d7be8cced4aa260828fcc8ba39818bf22100e92dc040484bd85d0689fd9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x858E 10804 bytes

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