Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9b8164868e46c5…

MALICIOUS

PDF

45.5 KB Created: 2020-08-10 01:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a8da5ed4ebb03617f1ca894f310b322 SHA-1: 6b677488a80a8a8a803b1be434aef5cbdee284e0 SHA-256: 9c9b8164868e46c54c4c403574dae2af687bd984d43ecea501f44493703a5269
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). This indicates a link farm or redirector strategy, likely intended to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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=c+programming+language+questions+and+answers+pdf
    • http://files.pfrmt.org/uploads/1/3/0/8/130814529/xalexusege-fedilun-buwumelemulo.pdf
    • http://files.centralcg.com/uploads/1/3/1/3/131398323/mibojivujipedulive.pdf
    • http://files.quantumav.net/uploads/1/3/1/3/131380354/4320175.pdf
    • https://cdn.shopify.com/s/files/1/0431/5319/5165/files/seguxixebiselulerimomitor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7591/1321/files/xonixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2966/files/bihar_stet_computer_science_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3715/files/carol_of_the_bells_choral_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/wuzotenowizuvabotefe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2630/files/57963854030.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/24998160788.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/zifetejoxagubakekotuwida.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/47711656088.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/9038702480.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/11006787663.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/niletiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.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_off0000741d.bin
cec5122b0b1414d1214edd1104d420943d0cc9969e6d4414e6d826a56dfdbc96
pdf-font-stream PDF embedded font (sfnt) at offset 0x741D 5484 bytes
font_01_sfnt_off000086b5.bin
6e241a90cdc5110deb88cffadf9e40736803b7d0cdddc9c08176da05547a81ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x86B5 9872 bytes