Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a077cb0137319ae…

MALICIOUS

PDF

39.2 KB Created: 2020-08-22 04:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9134fa8f8499a37220a8e51d7ad4ec8a SHA-1: 98920defc6ee64dacc56617c8ffd8d60a351ff15 SHA-256: 6a077cb0137319aead9ee574d2824fdb69af52a33f0c64e9b44598275e0bc67f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL https://ttraff.cc/pify?keyword=converting+measurements+worksheets+ks2, suggesting a phishing or scam attempt. The presence of multiple Shopify links, some benign and one potentially part of a link farm, further supports the malicious intent.

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=converting+measurements+worksheets+ks2
    • http://jafofin.ambercoveshoreexcursion.com/uploads/1/3/1/4/131406071/taroto-buxig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2823/3885/files/acc_guidelines_heart_failure_2013.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/66595162965.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/sample_aptitude_tests_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/zurileleritedud.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/26589759630.pdf
    • https://cdn.shopify.com/s/files/1/0435/9526/8264/files/kevamobemewodawuzunola.pdf
    • https://cdn.shopify.com/s/files/1/0438/0029/7633/files/minecraft_portalcraft_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/23103165366.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_off00005ba9.bin
a31798e5915a9a47f78711acd33b098d45382ef5071b3bab34c8b563ca81d5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA9 5320 bytes
font_01_sfnt_off00006dac.bin
8af95d972630d531e10545a0ad8b929aa81c4255af90374c94a6cd7416f15a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAC 10008 bytes

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