Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee0874c84fb50e4…

MALICIOUS

PDF

46.9 KB Created: 2020-08-19 06:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1acbbfa7f69acf721e13eefb1eca2ad SHA-1: febd953b922b84a2136cc3e0f078c67684f57d2b SHA-256: 5ee0874c84fb50e4eec352620784e161c8ea891f6acc81709afd8d8073b8073c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a registration app prompt, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and it also contains a large number of external links, many of which point to potentially malicious or suspicious domains. The document body itself is heavily obfuscated and contains the malicious URL.

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=check+register+app+android+free
    • http://files.myunfilteredeveryday.com/uploads/1/3/0/7/130775980/6271532.pdf
    • http://files.hayleyhudson.com/uploads/1/3/0/7/130775825/c1180ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/eliquis_sir_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/zuwakogexugiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9175/files/36170632376.pdf
    • https://cdn.shopify.com/s/files/1/0447/8022/4663/files/merge_jpg_docs_to.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/95644732659.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/rifezesebojagilowubigevow.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/sulakakomaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/pazajuwivujufexax.pdf
    • https://cdn.shopify.com/s/files/1/0438/4499/3181/files/13118880487.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c97.bin
8b52b355a6b84c5589f3f06f85a3b11c74b15e51869937c2ca0bc66db2dc1fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C97 5260 bytes
font_01_sfnt_off00007e70.bin
54ce3333854500717a50ab14d9600acce0eb2b672e411d5fdee8b8ec1d5127f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E70 10080 bytes
font_02_sfnt_off0000a0e2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E2 4324 bytes