Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf56339c9247882…

MALICIOUS

PDF

43.0 KB Created: 2020-08-10 12:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0cd06f552409e9df01af1f68facb69d SHA-1: c4bcea86897c6c11fedff210195157ebd97574fa SHA-256: 6bf56339c9247882ce62c3d494361809d6fc462ebe5ad8566e1a0e69bea5988e
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent link, 'https://ttraff.ru/pify?keyword=algebra+questions+pdf+for+ntpc', is identified as a malicious redirector. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking malicious links. No scripts were extracted, but the overall structure indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=algebra+questions+pdf+for+ntpc
    • http://files.evolvingpartnership.com/uploads/1/3/0/8/130874457/vewatamubagemepez.pdf
    • http://files.quintabella.com/uploads/1/3/0/7/130775490/jimutafesuxirife.pdf
    • http://zogete.briccawards.com/uploads/1/3/1/0/131070420/deridi-tupenumavir-wanopedileki.pdf
    • http://files.roddybridges.com/uploads/1/3/0/9/130969624/tidupazip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/96614650000.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/cambridge_english_advanced_cae_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/calabozos_y_dragones_5ta_edicion_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17612659915.pdf
    • https://cdn.shopify.com/s/files/1/0438/4201/1286/files/rikinalopepadivudazavuni.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/45563880220.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/98204834293.pdf
    • https://cdn.shopify.com/s/files/1/0440/7368/1061/files/88260664866.pdf
    • https://cdn.shopify.com/s/files/1/0438/6701/3280/files/turbo_350_transmission_rebuild_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/6063073093.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8623/files/wotlk_alliance_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/bexapesisoroxerujogerir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/fasexipamarofeziked.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_off0000518b.bin
4e820d804b47e9a643a82b47b4c2406ed3093bfec218322d26560595df905a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x518B 5460 bytes
font_01_sfnt_off00006418.bin
2b7241ae5f5b4d90dffc0a2f00c3bd4c07f8fe427616a2ee85ac5cd89326e406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6418 14424 bytes
font_02_sfnt_off00009124.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9124 4324 bytes

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