Malicious PDF — malware analysis report

Static analysis result for SHA-256 3749038501779d6a…

MALICIOUS

PDF

60.1 KB Created: 2020-08-02 17:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89cc09d47dd5a6c776b5adc0670b250 SHA-1: c550f668ddc511b7194aa4a0b5e57ea14d055fea SHA-256: 3749038501779d6a9eb4d62e8165a3dec821e1bc3c23bca77ed520552d98c8e9
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for phishing and malware delivery. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and references 'creepy minecraft skins', suggesting a lure to a malicious site. The presence of numerous other Shopify links, while individually benign, contributes to a link farm pattern, potentially for SEO manipulation or to obscure the malicious destination.

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=creepy+minecraft+skins
    • http://files.pawsadventurewalkingservice.co.uk/uploads/1/3/0/7/130776037/ronidenumolila.pdf
    • http://files.noahsthompson.com/uploads/1/3/0/7/130739060/xinewexuva.pdf
    • http://files.suburbanbakes.co.uk/uploads/1/3/1/6/131606396/7925818.pdf
    • http://mezekap.beavercreekbowlcompany.com/uploads/1/3/0/7/130739625/8522069.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/90247240512.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/vewimupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/72925126330.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/tolikiluxidadas.pdf
    • https://cdn.shopify.com/s/files/1/0437/0399/2485/files/teporipefazolager.pdf
    • https://cdn.shopify.com/s/files/1/0438/2513/5776/files/nugizovuwitudoxako.pdf
    • https://cdn.shopify.com/s/files/1/0436/1686/2371/files/ftb_revelation_changelog.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/71800690242.pdf
    • https://cdn.shopify.com/s/files/1/0434/1740/3559/files/zenofabiligif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15074065918.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/bitewapowamajirobu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3690/1527/files/10742785692.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/kikejaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fb6.bin
e8e605179533eac7728dce5ba15c30eca6041d9fb7982cb2a560bbfa5c2e3dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB6 4996 bytes
font_01_sfnt_off0000b09d.bin
f0c8e8cf4097477d54353d8626514563924cba4784455fab66460e64ff203d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09D 10632 bytes
font_02_sfnt_off0000d4f5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 4324 bytes

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