Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b40ea7602093e86…

MALICIOUS

PDF

45.2 KB Created: 2020-08-18 15:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dbc7f738d9777dfe6adb862066cfe65 SHA-1: 5b4c86f7c31db2c728bc3989e8a3e0b170175c49 SHA-256: 1b40ea7602093e8646e4cf8ea0eb647e6bce353ce82534c15414e02e0032e311
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=binaural+music+for+studying'. The document body, though partially corrupted, also contains this URL and other links pointing to external PDFs, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=binaural+music+for+studying
    • http://folox.mymotherssecrets.com/uploads/1/3/0/7/130738546/suwunat.pdf
    • http://wadulo.miglek.com/uploads/1/3/1/4/131412032/2399621.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/interview_questions_for_b_tech_ece_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0435/5630/7107/files/rewukopaviditajux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexivopagutufaxusezonav.pdf
    • https://cdn.shopify.com/s/files/1/0435/4670/6088/files/39942990869.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/perapef.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/35668973931.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/central_limit_theorem_formula.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9075/files/48661812445.pdf
    • https://cdn.shopify.com/s/files/1/0438/2221/9421/files/49156831465.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0454/3918/9142/files/35879370939.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_off000061f2.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F2 6744 bytes
font_01_sfnt_off000072d9.bin
04de0cfa411242bf4afbdcab4f83883a6fd8c374fbdbdc7088cb5961a7a388a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D9 5492 bytes
font_02_sfnt_off0000856b.bin
503e46d26e1f2087b1f35b790795a634b6198f522cb8a89618504c32197c8525
pdf-font-stream PDF embedded font (sfnt) at offset 0x856B 10116 bytes