Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6f4d1dedf07864…

MALICIOUS

PDF

41.4 KB Created: 2020-08-21 20:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 382ca8058b2c3fd8700cf5ececb9c93a SHA-1: ec8cf52d9110841d3719c1d5458c7b4bc403e84c SHA-256: 1f6f4d1dedf07864e38bf3ff3a8d8bbca2a1f8d2d28f38f4a9321708c06d9847
152 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 of which point to a link farm hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=2000+buick+century+custom+manual'. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated.

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.cc/pify?keyword=2000+buick+century+custom+manual
    • http://xutoto.nasituan.org/uploads/1/3/0/7/130740480/b1f14fc6.pdf
    • http://fefajix.thelopezlibrary.com/uploads/1/3/2/6/132682663/fitobefemi.pdf
    • http://files.baronehealthcenter.com/uploads/1/3/0/7/130775828/gumara.pdf
    • https://cdn.shopify.com/s/files/1/0431/6033/8586/files/6810075336.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/deed_of_sale_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2017/files/free_online_converter_to_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0437/6802/1141/files/t_vn_mua_android_tv_box_tinhte.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/cisco_network_academy_packet_tracer.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8041/files/fuxugopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7645/files/zedabisisijiji.pdf
    • https://cdn.shopify.com/s/files/1/0435/8357/0078/files/bor._up._nic._in_caste_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/88101905250.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_off000054a4.bin
677602d86f8cf193671f95255977a88ccfd64e7d917deb8d8aa6319e65c21851
pdf-font-stream PDF embedded font (sfnt) at offset 0x54A4 5312 bytes
font_01_sfnt_off00006691.bin
7794165a1c1c829a5d604b34c62ff94b0dfedb01d8a5bcf12b8de05acd26d2d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6691 10664 bytes
font_02_sfnt_off00008af9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF9 4324 bytes