Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1d361cf585d6c3…

MALICIOUS

PDF

39.0 KB Created: 2020-08-08 18:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57c6f051f6fdb3e89f3f647bc8135a09 SHA-1: 4c967325debec4359dc325a7d9a8a89d3938e5b4 SHA-256: 5f1d361cf585d6c312f67239d99fadd7e9994eaf5b8d694e874eec938520b1b4
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, with the primary malicious link being https://ttraff.cc/pify?keyword=atys+3s+pdf. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content, likely as part of a phishing or scam campaign.

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=atys+3s+pdf
    • http://files.maxrhodesarts.com/uploads/1/3/2/6/132683357/201db77b38e2.pdf
    • http://files.colinjlmccartney.com/uploads/1/3/1/1/131164159/popeponuraju-perufukiraf-lipakinubosop.pdf
    • http://faguv.indigartmildura.com/uploads/1/3/1/4/131407089/443f0f6bb4.pdf
    • http://files.feliciaaroney.com/uploads/1/3/1/4/131437636/7b4620c.pdf
    • http://files.socorroboutique.com/uploads/1/3/2/6/132681824/61612bff1947b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/titigabibuzumazavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/94486811311.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/javascript_group_by_two_properties.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/lufekutini.pdf
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/celestial_navigation_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7229/files/lowinev.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7491/files/59889333309.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/bankers_algorithm_in_deadlock.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/jibabejolerazanigamiwoseg.pdf
    • https://cdn.shopify.com/s/files/1/0440/6666/8694/files/17330070538.pdf
    • https://cdn.shopify.com/s/files/1/0434/8506/9478/files/non_core_edition_windows_10_activation.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/catalogo_hinode_colombia_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051a3.bin
eac805058aa6a0422bab71f8f39b99ee57d2961634f553fa2926ae98724be2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51A3 4360 bytes
font_01_sfnt_off00006072.bin
5248d8756cec01a40617d54afb5c5fa03cc74d6dac0d56eaa29f86d62ffa7581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6072 9584 bytes
font_02_sfnt_off00008139.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8139 4324 bytes

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