Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e30f2ac591e8b29…

MALICIOUS

PDF

73.1 KB Created: 2020-08-21 04:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb555c40ae2eace903345fd46975241 SHA-1: 38f95c1e670f9b66233dbd21dc19181ddaef3855 SHA-256: 8e30f2ac591e8b298e0f6117df2b3a4cc4949d157a281bc0688cd878ca2dee83
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=ahs+season+3+episode+guide', is designed to lure users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on Shopify. The ML classifier strongly indicates maliciousness.

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=ahs+season+3+episode+guide
    • http://dumij.acscmerch.com/uploads/1/3/1/8/131856476/fewibuxum.pdf
    • http://gukex.questbestgsds.com/uploads/1/3/1/4/131438216/budewiwelenujo-guxukafidufowo.pdf
    • http://files.fyrishgundogs.com/uploads/1/3/1/6/131637325/fekepopipimagemiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5307/8933/files/tudijifud.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/84428479911.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/jujolixedemexatilutetar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/nuvobutodipugir.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/goalkeepers_with_100_premier_league_clean_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/1324479453.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2919/files/dexuku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12035000993.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/vifagu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d404.bin
7c3288eef0c7fe25cc6249e7e80a7af47041619aabf73dfde80159139ae9a21b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 5048 bytes
font_01_sfnt_off0000e51a.bin
9bd19e7b6f33ada4be3543f02099e2829b79ba9fd74cd694d276da8672765dec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 10664 bytes
font_02_sfnt_off00010986.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 4324 bytes