Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4319a67e67d676…

MALICIOUS

PDF

39.2 KB Created: 2020-08-07 14:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb159300b2289a8456cff21186eed9b SHA-1: c8caef4459e683a102b5a942e033640335d8c0dd SHA-256: df4319a67e67d6761ae89f47cf0f0baeed8b48d4d4ffd6ee61f77f101b397d68
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but the primary malicious link is to `ttraff.ru`, which is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=market+leader+business+english+advanced+pdf
    • http://files.laurelwooddoodles.com/uploads/1/3/0/7/130776611/7879491e6.pdf
    • http://files.canadoretv.com/uploads/1/3/1/6/131637546/noxiwutezepoxil_kakenolox_tanulij_kifuf.pdf
    • http://files.bltsnv.org/uploads/1/3/1/4/131438330/315039.pdf
    • https://cdn.shopify.com/s/files/1/0432/2145/0914/files/77776549276.pdf
    • https://cdn.shopify.com/s/files/1/0436/2951/0814/files/wabal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/penguin_readers_level_3_notting_hill.pdf
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/rti_application_form_pdf_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/army_class_b_uniform_setup_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/electronic_technician_resume_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/61697980184.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/54427566060.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/vomifudufubijovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jezimix.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/zapuwizabozilamofupomu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0243/6512/files/8201741085.pdf
    • https://cdn.shopify.com/s/files/1/0428/8308/8547/files/nutegojaruvurunavugepuw.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_off00005b08.bin
983fbc85401448b5a2023ebb906032e6c7e365932dc426cd59afb77b7ae901a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B08 5684 bytes
font_01_sfnt_off00006e69.bin
d17e5fbe9d072af357b0b2fbfc401eb5e500626ed68915ef5f86ef888a081fcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E69 9816 bytes