Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e91b42601d59cef…

MALICIOUS

PDF

42.1 KB Created: 2020-09-02 12:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ff646bd9b9d591d55e1f15495a2d4e2 SHA-1: d2cce23b5f9ff5b33e12720950a5dca3c20ff637 SHA-256: 5e91b42601d59cef1bcb9b7b886bbc9c5389ebdd61d12f5539faa82c8b2e7b11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'aws interview questions and answers pdf' and the malicious URL, suggesting a phishing or scam lure. The presence of numerous external PDF links, many pointing to benign content, indicates a potential SEO poisoning or link farm tactic to obscure the malicious redirector.

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/wix?keyword=aws+interview+questions+and+answers+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/dd4472_a6800cfa2a0b46eaae383e1506ab5ddd.pdf
    • https://static.usrfiles.com/ugd/9d869b_3468513c7e0a40afb87a90dd498218b1.pdf
    • https://static.usrfiles.com/ugd/f515ca_2cff7ce401394427a226cb237d2e0699.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6d962f75d774111b7aa9bd6f628e037.pdf
    • https://static.usrfiles.com/ugd/e2c250_b8e858792a774ca1824b69a2cc605886.pdf
    • https://static.usrfiles.com/ugd/23e9be_2b10b266ab4b4269bcfe2d59ddc255fb.pdf
    • https://static.usrfiles.com/ugd/e1a791_4acbbd44786744e19182b68cc0dc4c5a.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/capability_statement_consulting_template.pdf
    • https://cdn.shopify.com/s/files/1/0464/1429/9304/files/41209867469.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/livetus.pdf
    • https://cdn.shopify.com/s/files/1/0435/2842/1528/files/types_of_aquifers.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/53699211171.pdf
    • https://cdn.shopify.com/s/files/1/0429/3217/5014/files/tepanekoduluwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/52097307432.pdf
    • https://cdn.shopify.com/s/files/1/0434/6599/8501/files/past_tense_of_override.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/waxivupedagukalupe.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066dd.bin
d007c496aece6803bdfe0abec43ad79bc58bce7e69efd35efb72f4aaa74a062c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DD 5268 bytes
font_01_sfnt_off000078f1.bin
928a83059ed8f0fc034eb5ea9137c8e41b98ac8be6c427ad2f8ee496c2df9f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F1 10008 bytes

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