Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1030c5d8676fee…

MALICIOUS

PDF

42.8 KB Created: 2020-08-22 11:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7d57f8b8c2b2c0b5175c7e988241732 SHA-1: 48a1a2217d0bcc2da4484998bca761762fe51fd4 SHA-256: 7c1030c5d8676fee0552ce542822929b6fd7a3b127332dfdec3c8dc2ce0afb26
202 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector (ttraff.com) and others that appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The presence of a download button lure and the overall structure suggest an attempt to trick the user into downloading a secondary payload from the redirected URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=apics+cpim+books+free
    • http://gukorujo.carriagehousepilatesandwellness.com/uploads/1/3/1/4/131438577/04570.pdf
    • http://wiloku.kimonocha.com/uploads/1/3/1/4/131482803/jabibivegezu.pdf
    • http://jeped.coyotegame.com/uploads/1/3/0/7/130775478/561a7ab11b3a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1083/9960/files/hand_car_wash_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/cat_c15_belt_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/tetogu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0060/1504/files/48840249547.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2655/files/tenulibagekaxodibuwofewo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3447/files/87405473554.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/online_gift_shop_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/6258/2693/files/29830689675.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/orchestral_instrumental_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/zuwerikunesoziz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/66570751747.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/77127763715.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_off00006973.bin
c46445f281dcef2308439be819c256a86a98ede870afb27e548cdce3519b8329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6973 5112 bytes
font_01_sfnt_off00007abf.bin
6566bd734cc6f3077bf0b2c9163f8272ea9104a64883fdff2bc6e00c8633e21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABF 10476 bytes

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