Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c2b7e29896fd21…

MALICIOUS

PDF

53.4 KB Created: 2020-08-18 17:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a8dba02ce7acc264113fbaba2ba1f40 SHA-1: d9017eed37cc3e531fb7724db350b4f478b488fc SHA-256: 73c2b7e29896fd218ca1a094646a6c109986b336bbee8f58ace15a0863133398
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, 'https://ttraff.cc/pify?keyword=homewood+flossmoor+high+school+report+card', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a report card and the malicious URL, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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=homewood+flossmoor+high+school+report+card
    • http://files.pqh.com/uploads/1/3/0/7/130739684/limudo-ranuro-majesakobo.pdf
    • http://files.daviessurveys.com/uploads/1/3/0/7/130738951/608a06508.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/20989373238.pdf
    • https://cdn.shopify.com/s/files/1/0451/8517/1607/files/absolute_value_inequalities_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4547/files/active_english_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1727/files/81101853056.pdf
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/stanford_antibiotics_review.pdf
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/anticoagulants_used_in_blood_bank.pdf
    • https://cdn.shopify.com/s/files/1/0427/9648/2727/files/lullabies_to_paralyze_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/18999380447.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6689/files/4701181022.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/chennai_express_movie_mp4_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/49817839063.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/91482891564.pdf
    • https://cdn.shopify.com/s/files/1/0437/8145/6023/files/sunilodazobamezutifu.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_off00009117.bin
40a031977a722c8e453dd47816675ed58266a106c80a2f7318689145c491c47c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9117 5624 bytes
font_01_sfnt_off0000a427.bin
d334f87689eb845b6ce3913cf11cf51e1cc04a0ff7fb5e76758de9054a205d83
pdf-font-stream PDF embedded font (sfnt) at offset 0xA427 10728 bytes