Malicious PDF — malware analysis report

Static analysis result for SHA-256 0541e5bfd5ae1518…

MALICIOUS

PDF

42.1 KB Created: 2020-09-06 04:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2362a361a543a0423338fa3ed91b12ef SHA-1: 58780987b47345fb2ed7fa1b585e75df0c651633 SHA-256: 0541e5bfd5ae1518b6b4a1cec5b089b9280fe6dda05a711a1ab78c97e1d8269e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to other PDF files, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. One of these links, 'https://ttraff.club/wix?keyword=hangout+for+mac+os+x', points to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs and link farm structure indicate a malicious intent to redirect users to potentially harmful content.

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.club/wix?keyword=hangout+for+mac+os+x
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/35959791482.pdf
    • https://cdn.shopify.com/s/files/1/0435/6289/3471/files/50276133142.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/antrenmanlarla_matematik_1_soru_zmleri.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/15472064855.pdf
    • https://cdn.shopify.com/s/files/1/0457/3544/4646/files/android._graphics._bitmap_to_base64.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_18866e61dee548eabd507e750bb06c69.pdf
    • https://static.usrfiles.com/ugd/e2c250_25969c82cecb42f5a303894c1ad2a9ae.pdf
    • https://static.usrfiles.com/ugd/ede58b_180846f18c2f4c73b8781d222d92834f.pdf
    • https://static.usrfiles.com/ugd/5a4c69_ceb4c10f392e40ebb7c083d2a2fbf25d.pdf
    • https://static.usrfiles.com/ugd/24deb6_fc2e2fef6ba04c56977ba8d99d503b45.pdf
    • https://cdn.shopify.com/s/files/1/0434/0085/5706/files/insurance_letter_of_guarantee_template.pdf
    • https://cdn.shopify.com/s/files/1/0450/3427/4966/files/43030649066.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/50847919552.pdf
    • https://cdn.shopify.com/s/files/1/0434/8366/0441/files/ribeleruvesukunutimogenax.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/allied_world_insurance_claims_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0465/2761/1038/files/year_3_science_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/6072/3865/files/48270855994.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_off00006749.bin
412b305f0439b6a9cb59e415dc7bb10ba5519ec839c19012d36ce87317145958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6749 5200 bytes
font_01_sfnt_off000078ec.bin
f01901c343d63ad403618ef29871b0c5bbbd36f000e160ac4aae045ab44a9f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EC 10128 bytes

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