Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb77a35e98f40a4…

MALICIOUS

PDF

60.4 KB Created: 2020-08-06 13:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5301f6dc432a19256e5d69478fe3d3 SHA-1: 8c1904745626db9ff1af71497a35e87f108cb2ee SHA-256: bbb77a35e98f40a4cc82fa48a9147f6313e1fdc1c38da775dbf2b6ed8b4192b1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure via 'ttraff.com'. Another heuristic identified a large number of external PDF links, many hosted on 'cdn.shopify.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

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=miocardiopatia+dilatada+ni%25C3%25B1os+pdf
    • http://files.kristinreeg.com/uploads/1/3/1/3/131383434/8677821.pdf
    • http://files.sunglasspanache.com/uploads/1/3/0/7/130775045/fd1debb750b5a25.pdf
    • http://files.cedardifference.com/uploads/1/3/1/4/131453247/kawelodorivuj-xepin.pdf
    • http://files.nouveaumedic.org/uploads/1/3/0/7/130775357/7671489.pdf
    • http://files.downtownldnliving.ca/uploads/1/3/1/4/131438847/pareduvevupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/typing_club_auto_type_tamper_monkey_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/9409/8598/files/89101577774.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/reality_therapy_journal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/powazo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7395/files/metamezagonirig.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/widijinavetoxonadefav.pdf
    • https://cdn.shopify.com/s/files/1/0428/4494/6588/files/54998046158.pdf
    • https://cdn.shopify.com/s/files/1/0432/3439/4276/files/70705921783.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/gepaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/30827520605.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/aprendizaje_significativo_redalyc.pdf
    • https://cdn.shopify.com/s/files/1/0438/9067/1771/files/child_support_agreement_letter.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/vazimaxidukugizo.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_off0000aae5.bin
de6eb4eed308a43cf5f41e374d1914f2b5af246cf15aab05b57cc9516965014e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE5 5364 bytes
font_01_sfnt_off0000bcfe.bin
8b4eb04d45f72669918d66ccaf70e3ae2bfb8044f097ba446141f2baba0a38cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFE 11484 bytes

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