Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3539f8fd89e9526…

MALICIOUS

PDF

41.4 KB Created: 2020-08-24 19:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d012c157a633c8f6b1d10978b62874f SHA-1: 91d3cfd8d360d8c48e28be79e99b2ab42aeba507 SHA-256: c3539f8fd89e95260b486285d06b4ad1ce20037b875c6dc141b447c56a35a443
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised with a lure related to HIV/AIDS testing. The document also functions as a link farm, pointing to numerous other PDFs hosted on Shopify, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms a high likelihood of a phishing or malware distribution attempt.

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.ru/pify?keyword=hiv+aids+test+app
    • http://mizarebuz.anstudio.fi/uploads/1/3/0/9/130969600/wudubuwazewiji.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/zibezozakizumiwokere.pdf
    • https://cdn.shopify.com/s/files/1/0431/1043/2930/files/computer_certificate_sample.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/xenoblade_chronicles_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/nararanasareb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/kr_chrome_fimfiction.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/likabinowazigise.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6167/files/reduction_formula_integration_by_parts.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5331/files/asphalt_8_pc_crack.pdf
    • https://cdn.shopify.com/s/files/1/0431/6502/4412/files/firogojutujumupupuge.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavijado.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/allahabad_high_court_order_copy_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/96428390010.pdf
    • https://cdn.shopify.com/s/files/1/0434/6567/0806/files/sogopinutalevefusopaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/jibagosidukanepuferupuza.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_off000054a7.bin
2b4b43a8b465c116d461d5b6ae5781651b5aac9104e593bb9f1023962c34d4b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A7 4416 bytes
font_01_sfnt_off000063ab.bin
fdbf0a7d9d32da645ce87bed2f060516e4b03a54cce4fb07ea5aa79fe95e4d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AB 12284 bytes
font_02_sfnt_off00008adc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADC 4324 bytes

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