Malicious PDF — malware analysis report

Static analysis result for SHA-256 123431a8b31f3c9f…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 00:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9b48ca2601cdf6bac93fc34cf58a3b SHA-1: e82a0a523968f7bc29fe2aa329c1d9508a4753f2 SHA-256: 123431a8b31f3c9fec1e69f60b08ae797403a2498b81e507e49736917c95bcf7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to mimic academic resources. One of the primary links, 'https://ttraff.cc/pify?keyword=introduction+to+categorical+data+analysis+solution+manual+pdf', redirects to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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=introduction+to+categorical+data+analysis+solution+manual+pdf
    • http://files.keithgriffithssquash.com/uploads/1/3/0/7/130776743/3906400.pdf
    • http://files.miam-foundation.org/uploads/1/3/1/8/131856815/13e1f0.pdf
    • http://files.bodilheggo.com/uploads/1/3/0/9/130969705/werekugexa.pdf
    • http://files.ccnaacademy.com.au/uploads/1/3/0/7/130739996/77c436.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9785/0017/files/32169128255.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/collections_in_java_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/wivimede.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/causes_of_tumor.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/64629651394.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/tefelunefisuburuzeludogev.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/96800983840.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/pokemon_adventures_sun_and_moon.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/how_to_add_user_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/20252462807.pdf
    • https://cdn.shopify.com/s/files/1/0431/0800/8090/files/66038782091.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_off00006fa8.bin
68897e72e476f9b6ae6892fed2b295024d4868453275c53dcc0005eeef25deac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA8 5512 bytes
font_01_sfnt_off00008254.bin
a74d7ca83809ba68ba7d80ca544187bc5e9e9cee1a5f754fac0d8a18c69bd6af
pdf-font-stream PDF embedded font (sfnt) at offset 0x8254 10204 bytes