Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0d32d1965b4533…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 06:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9459905bef3268d3c57e664ced3bc4 SHA-1: 5c304f18d7582b50510416f87e54a8bd18e950dc SHA-256: 9b0d32d1965b4533af195ca54d1dd938067453b9f7300c0cd377023dad219a21
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains keywords related to lesson plans and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.ru/pify?keyword=free+phonics+lesson+plans+pdf
    • http://files.newenergyera.org/uploads/1/3/2/8/132814593/bitofij-lurugosalarejuj.pdf
    • http://nunok.ipadbootcampforteachers.com/uploads/1/3/1/4/131437948/sugafejogugawemudo.pdf
    • http://files.mahlakiyaelblida.org/uploads/1/3/1/1/131164079/wemiropevilo-pinaxofax.pdf
    • http://files.flixtonacademy.com/uploads/1/3/1/4/131408954/2203421.pdf
    • https://cdn.shopify.com/s/files/1/0449/8512/2984/files/chemistry_raymond_chang_11th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2695/files/wodepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5471/8358/files/tugon.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/61077501741.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/renozadobugasimipelato.pdf
    • https://cdn.shopify.com/s/files/1/0440/2721/6037/files/autocad_file_to_converter_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/44183052515.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/fobipekaridekira.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/bogafigisolubuvinewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/zukemax.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/aulas_basicas_de_violo_para_iniciantes.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/wozatotukefusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/76023111415.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/butchery_business_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/89975542381.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_off00006611.bin
cd27f7662d5c2d3b3ad2c60d752f20f64eff83f32c498dad1fef2b2ca6683241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 5196 bytes
font_01_sfnt_off000077b2.bin
87bda2d288522876f0b99a4f2b575aa4d073effbd44824b93e19977e5367080e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B2 10312 bytes

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