Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b387221878cbb9…

MALICIOUS

PDF

32.6 KB Created: 2020-09-01 22:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9ec616a1963c5b6d4c286c8125ef486 SHA-1: 1a08ff0909ad96bd881da50172d048c2d10ce3eb SHA-256: b4b387221878cbb9e424688083125ea910393c4efb04b149564513313fb15bb7
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 for a malicious redirector at 'https://ttraff.com/wix?keyword=lp+bed+making+pdf'. Another critical heuristic identified a PDF link farm, suggesting a tactic to artificially inflate search engine rankings or distribute malicious links. The ML classifier strongly supports the malicious verdict. The document body, though heavily corrupted, contains fragments of the URL and keywords, reinforcing the lure.

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/wix?keyword=lp+bed+making+pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9957/files/49648319649.pdf
    • https://cdn.shopify.com/s/files/1/0462/7791/8880/files/xsplit_windows_7_32_bit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/wopapolino.pdf
    • https://static.usrfiles.com/ugd/b4609a_1ace9716c109418b91a38533ec43d3e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6eacc84c547487389b3ed79048008aa.pdf
    • https://static.usrfiles.com/ugd/76b6de_573c29ea67d04dcc8a4c6978d0255b4b.pdf
    • https://static.usrfiles.com/ugd/8b97dd_f5bf42a8dabc46298aaf8b89716a25f4.pdf
    • https://static.usrfiles.com/ugd/3b47cb_d1cc168f515a4be3adf4c0f336c096f6.pdf
    • https://static.usrfiles.com/ugd/95089d_5922ec26074b4deda52dad50fe6da8dd.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/6694994340.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5070/files/87060709641.pdf
    • https://cdn.shopify.com/s/files/1/0428/7712/4764/files/masobikivupizopizijarive.pdf
    • https://cdn.shopify.com/s/files/1/0435/5253/8773/files/biological_science_scott_freeman_5th_edition.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_off000043cb.bin
75c09efaab37361aa584c1019879efc729fe2a6feec87e2987864cf64b4d0d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x43CB 5200 bytes
font_01_sfnt_off00005574.bin
1a1accb3db3a7d01274ea73ee139862d7fa4cb91a40015c346378d99d4f60987
pdf-font-stream PDF embedded font (sfnt) at offset 0x5574 9552 bytes