Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b908aeaf430678…

MALICIOUS

PDF

38.9 KB Created: 2020-08-23 00:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c63c79a88dbe4b101cbaf4b9c765cc SHA-1: 35da7b477ee2ca3a090dcc7c4d4ab54b8a9b8933 SHA-256: 84b908aeaf430678bcfd3f0454c6cb7f5667f3d592dcddef8dd2425b2166d201
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.com/pify?keyword=guia+autometrica+mayo+2019+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but the presence of the link farm and the malicious redirector strongly suggest an attempt to lure users to malicious content or manipulate search results.

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=guia+autometrica+mayo+2019+pdf
    • http://files.faithbaptiststacy.org/uploads/1/3/1/4/131438676/2400428.pdf
    • http://files.richmondcountylittleleague.com/uploads/1/3/0/7/130738814/ee574ff831af9.pdf
    • http://files.natuurvakantiedenemarken.nl/uploads/1/3/1/4/131483266/bodidu-pajarovafuwen-danalomude.pdf
    • http://files.florabysk.com/uploads/1/3/1/8/131857782/593fb.pdf
    • http://gexusi.sophiaunfolds.org/uploads/1/3/1/0/131070054/movokon_bopurel_tiposerebofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/newom.pdf
    • https://cdn.shopify.com/s/files/1/0438/6645/6224/files/14387556141.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/old_version_of_yahoo_messenger.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98629167596.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6572/files/firojesireziterap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0432/6811/2550/files/angularjs_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/6052/6246/files/51104392847.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4001/files/absorcion_farmacologia.pdf
    • https://cdn.shopify.com/s/files/1/0440/5110/3894/files/92376899177.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/bapimafonexawo.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_off000051ba.bin
903ec062420cb27881ca145dcad3774279333334210d9ba5ceb3504b6a85a935		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51BA 5708 bytes
font_01_sfnt_off0000652c.bin
0df00546b234e900e8087a013fd12d1df0fd47beb9678834378b3b6218ac692c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652C 13212 bytes

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