Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba681434404908a…

MALICIOUS

PDF

40.9 KB Created: 2020-08-09 06:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc574b30a997d189dd375c81788a9755 SHA-1: 7a2d92ac91c8af305c97ef72f3159d99c647d5a5 SHA-256: 3ba681434404908a3bd1cae179b3df26559f363efe80011cfc84cb5e83886222
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially obfuscated, includes text related to 'Adverse effects of chemotherapy pdf' and the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=adverse+effects+of+chemotherapy+pdf
    • http://pudifati.bluchip.org/uploads/1/3/2/3/132302780/jemadajobanelan.pdf
    • http://files.laniereducationfoundation.org/uploads/1/3/1/4/131482991/e19ac.pdf
    • http://files.reclaimingbiblicalchristianity.com/uploads/1/3/1/8/131856646/majixinuvusu_verepakuwukin_jisisi_kidulomuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7234/6526/files/mexojejegojiguzenuxane.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/diraxobe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/5e_wild_magic_sorcerer.pdf
    • https://cdn.shopify.com/s/files/1/0429/0704/1958/files/redozoviz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/lawutodiramawapukolojek.pdf
    • https://cdn.shopify.com/s/files/1/0434/3994/7932/files/95109131770.pdf
    • https://cdn.shopify.com/s/files/1/0435/0771/2155/files/zofupimu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8956/7650/files/83894584769.pdf
    • https://cdn.shopify.com/s/files/1/0440/9769/9992/files/vanagon_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/36042143392.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/85776352088.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/zusitewazibuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/urbanismo_ecologico_salvador_rueda.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/acrobat_maker_for_windows_7_free_download.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_off00006213.bin
8fc6888d6b4a628eeef26646e0f30f45d08798bf5eac01111a0483c77d50110b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6213 5512 bytes
font_01_sfnt_off000074b9.bin
34e83edebed1e8e3669bd66a81656ea54f1f8fb33b4600ab1e0a31a9bf06bade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B9 9868 bytes

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