Malicious PDF — malware analysis report

Static analysis result for SHA-256 8031538e16cece6b…

MALICIOUS

PDF

44.9 KB Created: 2020-08-25 02:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c613bbc0370c4e898f624aa58d0959c7 SHA-1: 21905534e60dcc5f20f1753955797e63ff8e5120 SHA-256: 8031538e16cece6b98ed2c0fccf4e4d2d2f0cf50b09ec5f0c151a0fc443e67e7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness. The presence of multiple external links, including the malicious one, points to a link-farming or redirection 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.cc/pify?keyword=bpsc+online+apply+form
    • http://ruketazav.juniemoonie.com/uploads/1/3/2/6/132682717/90910.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/vison.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1119/files/fedudorafasezuro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/environment_and_ecology_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/90310995040.pdf
    • https://cdn.shopify.com/s/files/1/0437/0645/0074/files/adverb_of_time_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5899/5095/files/arbeitszeitgesetz_berstunden.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/cutting_edge_pre_intermediate_workbook_with_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/gobosinazijeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/convert_base64_to_jquery.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4757/files/kuzuwovupa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0155/0760/files/gurinufefibu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/pakiwujitebab.pdf
    • https://cdn.shopify.com/s/files/1/0437/9010/6775/files/sfg2_mod_apk_3._3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072bc.bin
23824575d087a928f9637b4371b8ae8e58f5fca754c5ca215dc87e815b32f950
pdf-font-stream PDF embedded font (sfnt) at offset 0x72BC 5312 bytes
font_01_sfnt_off000084b5.bin
3c2efe3c31589293e283257973dd2097a38166117ef64bca54c378bafe2a8f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x84B5 9936 bytes