Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b85f7b594fdaf7…

MALICIOUS

PDF

82.2 KB Created: 2020-08-25 18:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc6479dc5d3df01bd098e453bb243f9f SHA-1: 09c012ee7771c3a6d273d58fdc407f081fa7d85e SHA-256: c1b85f7b594fdaf77089f82d8b82b0a3fe1cb341d28ed38b8147c15b5d15a576
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=%25D8%25B4%25D8%25B1%25D9%2583%25D8%25A9+%25D9%2585%25D8%25B3%25D8%25B1%25D8%25AD+%25D8%25B2%25D9%2588%25D8%25AA%25D9%2588%25D8%25A8%25D9%258A%25D8%25A7'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded malicious URL is sufficient evidence of malicious intent.

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.com/pify?keyword=%25D8%25B4%25D8%25B1%25D9%2583%25D8%25A9+%25D9%2585%25D8%25B3%25D8%25B1%25D8%25AD+%25D8%25B2%25D9%2588%25D8%25AA%25D9%2588%25D8%25A8%25D9%258A%25D8%25A7
    • http://kaxuzutez.pawneeil.net/uploads/1/3/1/6/131607240/vijoxufiratoraso.pdf
    • http://files.joeberg.org/uploads/1/3/1/6/131606289/zunatolopatogagudula.pdf
    • http://files.thefelixfilms.com/uploads/1/3/1/3/131383456/sajusofuviwame_zededi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/credit_risk_analytics.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/debubijedizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2812/6618/files/murir.pdf
    • https://cdn.shopify.com/s/files/1/0450/3132/5846/files/bupusininadawu.pdf
    • https://cdn.shopify.com/s/files/1/0450/9748/4451/files/chevrolet_car_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7867/files/legotakojewuvitigori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57308776079.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/68649413287.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/bomosaxonamipibeperemajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/usar_el_cerebro_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/neraduragasozoreserobo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010074.bin
092041035cf1de2e96970ff92b3e5a1020d6dddf566a2754be4dda244576f62e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10074 33280 bytes
font_00_sfnt_off0000bc39.bin
dbff9e152aad335916b2bee87cd027f069b59f9160570467db14ecf46f1c4e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC39 4068 bytes
font_01_sfnt_off0000ca17.bin
897332a888b4dd7cea614f7a82892eed4ae3ff5ebef324d12b04de8067d3217e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 17788 bytes
font_02_sfnt_off0000e4b5.bin
36ecc7581adc288be4bfd4650fe475de915fcbe116340c670f6749399497cb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 8068 bytes

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