Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5f51e30cf24774…

MALICIOUS

PDF

37.9 KB Created: 2020-08-20 14:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27a6f21308a888483a327040b6136236 SHA-1: 0a66666f532f60fc6adb15da80f5c3d07dafda74 SHA-256: 6f5f51e30cf24774a6d6ee92abc19a3062f2bc72a220ff911a6ed8a891f02657
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text and URLs that appear to be part of a link farm or SEO spam campaign, aiming to drive traffic to potentially malicious 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.ru/pify?keyword=arputha+theevu+movies
    • http://files.millenniumcleaning.net/uploads/1/3/1/3/131398145/gopiveporodabirazum.pdf
    • http://files.shallyns.com/uploads/1/3/1/3/131380592/d88bc826a3dcb24.pdf
    • http://files.onenationingod.net/uploads/1/3/1/3/131384663/ximima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1251/1128/files/negative_prefixes_adjectives_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/pukomufuduxoretatumiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9176/3105/files/cch_chuyn_file_b_kha_sang_word.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4359/files/37068026358.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1000/files/xosufotopabajujezilife.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/calculin_matematicas.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/25267820234.pdf
    • https://cdn.shopify.com/s/files/1/0446/7536/7065/files/how_to_hack_psp.pdf
    • https://cdn.shopify.com/s/files/1/0432/6975/0940/files/eagle_scout_letter_of_ambition.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/53505859579.pdf
    • https://cdn.shopify.com/s/files/1/0437/0687/6055/files/93714763677.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_off00005730.bin
10271b4147c85ce85f1a80d3de0add20b462e91a9208261089a9737c24ebb75e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5730 5076 bytes
font_01_sfnt_off00006851.bin
4a2b2666c122ee256022a3486298cfd55a1f99e3dd3206a51a03a243447e8ad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6851 10124 bytes