Malicious PDF — malware analysis report

Static analysis result for SHA-256 78760b793c57135f…

MALICIOUS

PDF

45.5 KB Created: 2020-08-07 05:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abf7241035f03155a8cbeeff24acdf03 SHA-1: 1373b5b036ac5da8b68bfb8d036708e19df23cf2 SHA-256: 78760b793c57135f4420625ac6d868799de931697a14cb8591147724e4dca821
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'breast cancer questionnaire'. The presence of numerous external PDF links suggests a link farm or redirection strategy. 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=breast+cancer+questionnaire+pdf
    • http://files.eyeofthehearttherapy.com/uploads/1/3/2/6/132681749/3413825.pdf
    • http://files.chalkstix.org/uploads/1/3/1/6/131636584/bafoxewiv-wijavonojitobin-fadajasisixof-toripitineso.pdf
    • http://files.kansasmidwives.com/uploads/1/3/2/6/132681482/c816e7073fdd13a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/lenov.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/maytag_centennial_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/63649714275.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/13939357824.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/gupezubomopu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9703/7730/files/81975108608.pdf
    • https://cdn.shopify.com/s/files/1/0435/3294/3519/files/viliditiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7711/files/absceso_hepatico_cirugia.pdf
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/60761408462.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/44439117735.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/88616401514.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25696514874.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_off000067c8.bin
2dacd96fecb93b460b7ddb3a70042d9b7ff729ceeccd1c0fb06b7c93e0b5201a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C8 5172 bytes
font_01_sfnt_off0000795f.bin
f13ec9396ec6d90a896c723c57cb6ca7c4aead077e7f1fe1de2c5c86753b77de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795F 9936 bytes
font_02_sfnt_off00009b3f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3F 4324 bytes

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