Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ee45f6f050c700…

MALICIOUS

PDF

39.9 KB Created: 2020-08-03 08:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62b833f3adc34baf9d8fe0e578cc5ddf SHA-1: 5f1130ec2404b57327205c9be79e38dacfd7db3c SHA-256: 77ee45f6f050c70049ed09c092c2fb19a906b18ad6acc5432702ac06339c53c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=like+a+prayer+meaning', which is flagged as a malicious redirector. This suggests the primary purpose is to lure users to malicious sites.

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=like+a+prayer+meaning
    • http://files.nurturefamilychiropractic.com/uploads/1/3/1/1/131164157/juval.pdf
    • http://files.oceanfrontsugargliders.com/uploads/1/3/0/7/130775062/zilizifedowu_rorodezomezebo_tixasefinubara_wurezuk.pdf
    • http://files.naturalhealthprotocol.com/uploads/1/3/1/3/131378780/losovenubolaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/87538728247.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/felamisakawubibaxejurelok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/31584620069.pdf
    • https://cdn.shopify.com/s/files/1/0435/0207/6070/files/21519818801.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5521/files/sagivixuwelel.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/59068347278.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6801/files/81694816566.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4940/files/31356722909.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0938/files/dipuwexalowobofuwidov.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_off00005f3b.bin
58d14e0dc16531f7ecaf3daaa58f3a39c046393f555fab77240e507e47ef0f64
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 5036 bytes
font_01_sfnt_off0000705e.bin
769340e9a4b48af4340a1ff7307a59c1f8de4ab1e437d94d2b807aea0b955187
pdf-font-stream PDF embedded font (sfnt) at offset 0x705E 10316 bytes