Malicious PDF — malware analysis report

Static analysis result for SHA-256 b954894f13362502…

MALICIOUS

PDF

46.7 KB Created: 2020-07-29 18:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e9d32423b5aae281bc92d65edcf016d SHA-1: ed889832b3d4648c3bcf6e1f74a562719ea6b187 SHA-256: b954894f13362502191c0ea96f1d1536ebf4a85ece1961e65f755144da1273dc
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to educational materials. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to phishing or malware download sites.

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=grade+12+english+textbook+pdf+sri+lanka
    • http://files.bonnetcatering.com/uploads/1/3/2/6/132682607/1045a4303bf3d.pdf
    • http://files.tinkersgardenminiatures.com/uploads/1/3/1/4/131437044/5572b95.pdf
    • http://files.elliottsaslow.com/uploads/1/3/1/4/131452949/zaxejakemiremoxusa.pdf
    • http://files.donerightpoolheating.com/uploads/1/3/1/4/131454190/6464814.pdf
    • http://files.krististreatery.com/uploads/1/3/1/8/131857782/4863510.pdf
    • http://files.krististreatery.com/uploads/1/3/1/8/1318
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/75861308684.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67257536452.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/23677900013.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/60692595256.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/15316480469.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6961/files/47318277067.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/vezimud.pdf
    • https://cdn.shopify.com/s/files/1/0433/3997/2773/files/zavotikibefiropux.pdf
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/10872066261.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/94585269392.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5129/files/vodumijekedod.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/33898940088.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.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_off000075f0.bin
192d25176e09866d24c6c2c76e6be9583f05ade7d17914cb41e92ca3f1af0243		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F0 5580 bytes
font_01_sfnt_off000088e9.bin
7a8e2670ca6acf97181d926f44e20b8d4f968bb7e01acb635c296630cae093d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E9 10712 bytes

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