Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f5fd097dd9606b…

MALICIOUS

PDF

43.9 KB Created: 2020-07-31 01:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6dd78931b2d37a4da4520693aff6484 SHA-1: e17cd60d7bd889b4af4b9fe0eb724a4e4d5b0382 SHA-256: 37f5fd097dd9606bf6eb00d15484c53722488d07a8ce9661e1d30f71d5ac77a3
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to HTML links and PDF creation, aligning with the heuristic findings. The ML classifier also strongly indicated 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.com/pify?keyword=html+link+to+pdf+online
    • http://files.sweetboxbylaura.com/uploads/1/3/0/7/130776167/8986743.pdf
    • http://files.greatpurpose.org/uploads/1/3/0/7/130739287/doxagigix.pdf
    • http://files.discoveryroofing-oahu.com/uploads/1/3/1/8/131856380/6862220.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/wawagemitekigetalasilubuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/40352191117.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/tisetejinotafobazofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/welumotapolunemo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4616/4897/files/gajazixakutinej.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/91899443391.pdf
    • https://cdn.shopify.com/s/files/1/0434/1003/0759/files/zixevuful.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/58925154971.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0037/files/54099486093.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8182/files/xiredewelejupa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/68488524473.pdf
    • https://cdn.shopify.com/s/files/1/0429/4167/7731/files/tovasojopo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.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_off00006ee2.bin
9221bba8c324bd3befc5a98f20101146bc3e3bb19a190d47528733461b960669
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE2 4516 bytes
font_01_sfnt_off00007e21.bin
387ac6639d243e3d532bca05b0f376b265ea4aca23d8380ee4fff122a7dd4a77
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E21 10728 bytes