Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d0db9d69bd32e4…

MALICIOUS

PDF

64.0 KB Created: 2020-08-11 22:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa262c040a4770fc40d8e6e2a2c7c174 SHA-1: 0848bbff8ad50f1e7ce8b49a7c1f7d20ffff3ba8 SHA-256: b6d0db9d69bd32e41f9960ba357061a643c6f93d9e455acc0467887c57af07b9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=adjectives+and+their+synonyms+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure.

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=adjectives+and+their+synonyms+pdf
    • http://files.growinglearningdigitally.com/uploads/1/3/1/4/131454024/7b67cd.pdf
    • http://files.easternsloperanch.com/uploads/1/3/2/6/132681404/3588728.pdf
    • http://files.musicincorporation.com/uploads/1/3/1/3/131381539/6721888.pdf
    • http://files.mocoalliance.org/uploads/1/3/1/4/131483020/ratavokiti.pdf
    • http://lexapoba.greaterlifeheritage.com/uploads/1/3/1/0/131070306/bixipitademusewu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4707/3445/files/pijawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/minor_7th_chords_piano.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/47698857111.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/46719921836.pdf
    • https://cdn.shopify.com/s/files/1/0434/0885/1098/files/mirelumisifituga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/60595108740.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0438/5410/2688/files/nizupabixogotowawober.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/56514312477.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/2807765022.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/english_unlimited_placement_test_cambridge.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/5035786241.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_off0000bc34.bin
d771adb7bfb07b3dfcda85f9344d5540051e9b6532dd58555e56dfad6635e8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC34 5592 bytes
font_01_sfnt_off0000cf1d.bin
db9c42c1f4be92257625202ecf4268b0aa571c7470bb2bddbecac1ca7bf75f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 10552 bytes

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