Malicious PDF — malware analysis report

Static analysis result for SHA-256 157920a321dc1f05…

MALICIOUS

PDF

43.3 KB Created: 2020-08-29 18:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c218d67a34def544ffd685e296c3bd5c SHA-1: 6d287e6b2472f5b3217815485877454656e8fb38 SHA-256: 157920a321dc1f05b454af8e5da20d239c13463641ccbe85c5b4784a2be63399
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and appears to contain the malicious URL, suggesting a lure to external content.

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/wix?keyword=lil+snupe+no+games+lyrics
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0465/0110/1720/files/download_vmix_21_crackeado.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/easy_brain_teasers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3475/files/68098724668.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/nufom.pdf
    • https://cdn.shopify.com/s/files/1/0440/0549/0846/files/wogizitefipevofonamelewu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4243/files/zevadadotalojizadigapexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3575/files/rent_brokerage_receipt_format.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0433/4397/0463/files/borarorepufovomeruzar.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/43702703019.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/92531602110.pdf
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/3792498923.pdf
    • https://static.usrfiles.com/ugd/b8c837_d21579b3702248fe8052b3cb6aa524ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_e03b998dd02543e581a86a6f2010f241.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_off0000628a.bin
a25fd50d2c817466ce3c096b6e9aa89ddd1156313078509bda1751194890390e
pdf-font-stream PDF embedded font (sfnt) at offset 0x628A 5296 bytes
font_01_sfnt_off00007477.bin
107ce5a6726b9afa6acf1a1a912149ec929a71c112305b7612a215ea56fd19e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7477 14048 bytes