Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c58e72d7b0e792…

MALICIOUS

PDF

42.2 KB Created: 2020-08-05 10:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f15cdd576fb096b762ac03695c0fa9f SHA-1: 349487f8dc1dc7ee6465fa0694514d7e1d962b2d SHA-256: b5c58e72d7b0e792bfbad48bcbdb2e28be82cadd3aa5dc9e9be218b1d257882f
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Sociology of law pdf download' and the malicious URL 'https://ttraff.cc/pify?keyword=sociology+of+law+pdf+download', indicating a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious.

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=sociology+of+law+pdf+download
    • http://files.fireflyline.com/uploads/1/3/1/4/131437932/4989692.pdf
    • http://files.ncwknittersguild.com/uploads/1/3/1/6/131637919/vatukadewojot.pdf
    • http://files.movingartsoftampabay.com/uploads/1/3/1/4/131437295/kedivuwometimuz.pdf
    • http://files.dongpu.studio/uploads/1/3/0/8/130813301/ziwitewebam.pdf
    • http://files.casapba.org/uploads/1/3/1/3/131379213/fe2865a349.pdf
    • https://cdn.shopify.com/s/files/1/0434/7530/4612/files/red_cross_instructors_corner.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83406059157.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/34081622111.pdf
    • https://cdn.shopify.com/s/files/1/0437/5091/6247/files/dos_mundos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/96430024401.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/loxexagoxofokonuxomew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/zurotat.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/85886434243.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97503793953.pdf
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/gobezalafenura.pdf
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/zarotoguwave.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/34125599061.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_off00006644.bin
0fd0ea60b50e2f2169bc4aa23d67cfc7a67a8173381b507ed1af346a06c85a86
pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 5344 bytes
font_01_sfnt_off000078a8.bin
e5b424d7db61d3b68de695f8f7f26573a118add620632ac6e5a1e16866c37cd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x78A8 10200 bytes