Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b18a9424448ae7f…

MALICIOUS

PDF

33.9 KB Created: 2020-08-21 16:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 551ba405b4807f83ab1d935b23bdda56 SHA-1: c8bf119bf1e3c1d3a3b7b79e1e1a1cf8908ad3c4 SHA-256: 7b18a9424448ae7f39400fb88bb442d0ae7fb94920eeb3889f27744d996e2357
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=brobar+boli+song+whatsapp+status+video. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains the malicious URL and other embedded links, suggesting an attempt to drive traffic to potentially harmful sites.

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=brobar+boli+song+whatsapp+status+video
    • http://kivemusu.aiohandcrafts.com/uploads/1/3/2/7/132740619/3812890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2753/7828/files/quizizz_american_revolution_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/xubax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/middle_school_vocabulary_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0762/files/english_vocabulary_list_with_meaning_in_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/11100610933.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/13834516910.pdf
    • https://cdn.shopify.com/s/files/1/0431/7557/5709/files/54401662045.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/37477297788.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7269/files/chemical_formulas_list_for_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0435/4611/6248/files/tirojaxeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/786_269_2542.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004539.bin
c0930272eb4a47467f4769aa31e0919fbbb3b265cd8cabedc8ef181a76410c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4539 5560 bytes
font_01_sfnt_off00005828.bin
43c1f987c876a85ebf5d8c5832aad36ebaed7a1e0b0eec76c5dd74a2164d9f79
pdf-font-stream PDF embedded font (sfnt) at offset 0x5828 10192 bytes