Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fb7881ac5eaf1d…

MALICIOUS

PDF

43.5 KB Created: 2020-08-05 03:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169f03bb47321a99e902f92fec53eff7 SHA-1: d2c9be7a262db575bf43b956a5fd378add7402df SHA-256: a9fb7881ac5eaf1d6e97515c54325d0df5dc9841b1383db6ead95ef6124a68f6
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to shopify.com domains hosting other PDFs, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at ttraff.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting the document's primary purpose is to redirect users to 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=believe+in+yourself+by+joseph+murphy+pdf
    • http://files.cliostools.net/uploads/1/3/1/8/131871714/5201027.pdf
    • http://files.wellfitmn.com/uploads/1/3/2/6/132695493/wewuse_minuzako_bukolexinexipid_jaronuf.pdf
    • http://files.edisonpto.org/uploads/1/3/1/3/131380591/disadusaz.pdf
    • http://files.whypetaeuthanizes.com/uploads/1/3/0/7/130739340/9774769.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/xikixotegedajebofipix.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/44167296252.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/butoxozovalotodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3829/files/poxiwetisotiduvatagige.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4837/files/70855653327.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/89740297361.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/molafuran.pdf
    • https://cdn.shopify.com/s/files/1/0437/3728/4762/files/99025919191.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/3765624118.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/inheritance_cycle_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/2694/0067/files/how_to_export_animation_in_krita.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/35837026932.pdf
    • https://cdn.shopify.com/s/files/1/0433/4167/6694/files/39771984375.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/63453814279.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b8e.bin
7924ab8c95c566acbddca26e29639ca9f3bb7595d3f8d35a3beddc0d99d5083b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8E 5500 bytes
font_01_sfnt_off00007e23.bin
940afa91c7bfaa8af960e4c815e7117255e3e05b93c2750847a217d98421ff88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E23 10096 bytes

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