Malicious PDF — malware analysis report

Static analysis result for SHA-256 7097a827afb29888…

MALICIOUS

PDF

50.7 KB Created: 2020-08-06 12:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1584f43e00e417bd81c4b6ba35e0a281 SHA-1: ec9ef21fec101f614f5869f884e73b5814c9bc9b SHA-256: 7097a827afb298881f235f4a2476b238edd67f6a3cb037bf17dd7eca5ca58dbe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a redirector service, which is a common tactic for distributing malicious content. The document body and heuristics indicate a lure for a 'free guide' to encourage clicks. The ML classifier strongly suggests malicious intent, likely involving exploitation or further payload delivery.

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=allyn+and+bacon+guide+to+writing+7th+edition+pdf+free
    • http://wupikama.holocaustinfilm.org/uploads/1/3/0/7/130738732/7c2f7ff31.pdf
    • http://vakijif.rollerstudija.com/uploads/1/3/0/8/130874633/76f190.pdf
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/comptia_casp_study_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/30184051986.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/43344216568.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/80839775353.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/49719610523.pdf
    • https://cdn.shopify.com/s/files/1/0434/8733/0464/files/2995313816.pdf
    • https://cdn.shopify.com/s/files/1/0435/7393/6291/files/bujivulixazakego.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/67787301665.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/33512490110.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4387/files/40863945056.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/30032536072.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_off00008438.bin
3c4e03b619ed77943146568bffcbfc0eb045ce846ef592604bb5c42496973e6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8438 5640 bytes
font_01_sfnt_off0000978d.bin
f5ddf49c6d50934b8816164a916db378cf4040e82d1b7e5efa605ad05c226892
pdf-font-stream PDF embedded font (sfnt) at offset 0x978D 10596 bytes