Malicious PDF — malware analysis report

Static analysis result for SHA-256 686cab6d806008a1…

MALICIOUS

PDF

42.3 KB Created: 2020-08-03 18:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b8a043b4168791925e16289f41106b8 SHA-1: bc21e172cfd83c1d5cf55e24baf3e70fa315f8fc SHA-256: 686cab6d806008a11a567bfd3bfc194bb78f43a9987f0bc9b303eab71ae56c71
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=bk+coupons+august+2020+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to coupons and dates, suggesting a lure to entice users to click the malicious links. The ML classifier strongly indicates 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=bk+coupons+august+2020+pdf
    • http://files.airlinepilotservice.com/uploads/1/3/2/7/132741555/getoduv.pdf
    • http://files.surrenderedtochrist.org/uploads/1/3/2/6/132681656/wulegi.pdf
    • http://files.violiningaja.com/uploads/1/3/1/6/131606672/xinajatisugojetojage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/logan.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/gumagununogodasoxef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/58587996138.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/famerilebigorelunufub.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/2459792336.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/cr_10_monsters_5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/burefizaramapomile.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3258/files/vokininisakonate.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2981/files/18872144089.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/negonarufefozosaburesid.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/woxijazetofu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000658b.bin
0c3c64d7812edadc1df8e383293ef48c79fd97901c7dd110b14a6e80bb3b7cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 5584 bytes
font_01_sfnt_off000078b0.bin
579d7fc608ecc512d3c369de5ee0ed8a8e70ffd550effc5e3fa25db52fc6c09b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B0 10328 bytes

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