Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0810555a65f11a…

MALICIOUS

PDF

36.1 KB Created: 2020-09-18 02:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91cbd1f9784a40a879381b68783fc1d SHA-1: d953f37a55e4669ca444375d00923847a1b2dc9c SHA-256: 5d0810555a65f11aff09691db52c9fe5bc349dedfa997fd6aa61891991edd911
154 Risk Score

Malware Insights

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

The PDF contains a link farm, with one primary malicious redirector URL disguised as a troubleshooting guide. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the PDF structure itself facilitates the attack.

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.club/wix?keyword=lennox+elite+furnace+troubleshooting+guide
    • http://files.missionadventuretours.com/uploads/1/3/1/4/131453588/41578.pdf
    • http://fagedo.exeterthreading.co.uk/uploads/1/3/1/4/131406390/4631232.pdf
    • http://rulejid.thebearsnetwork.com/uploads/1/3/0/8/130874691/61772adc19f.pdf
    • http://files.gzsartapalooza.com/uploads/1/3/0/7/130775347/183c20273385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://df657cbd-befa-46d6-8bd5-dbc9681a2f82.filesusr.com/ugd/61b8bf_09704a7ae72c4989b7024b15e51fd0e6.pdf?index=true
    • https://f064333f-9beb-415c-bf5a-371d7a73847b.filesusr.com/ugd/03a576_ddad73b0520540138aaa896aadf744a8.pdf?index=true
    • https://bc8e72b1-ff48-4938-badb-3b7e92d32871.filesusr.com/ugd/a91264_7318f767aec249c598b0901ec0b550f8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0452/7859/3185/files/aimbot_fortnite_ps4.pdf
    • https://cdn.shopify.com/s/files/1/0428/7224/2342/files/bypass_frp_apk_huawei.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1017/files/lepuduvibotupuwu.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_off00004d93.bin
066affe85203fe09353eef2e7d55020483368bacab382327cab892bafd9da6d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D93 5432 bytes
font_01_sfnt_off0000600a.bin
1f0b9b78f9fc6bcdec2995126d1fc777e06f983cc903d6af492f1b0107d81e91
pdf-font-stream PDF embedded font (sfnt) at offset 0x600A 10468 bytes