Malicious PDF — malware analysis report

Static analysis result for SHA-256 262fdfc290504496…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 05:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37085c62c0d95dc89fbeb883d21ddd58 SHA-1: 0b899acce9a8c53740d7d840e1c30031a033e228 SHA-256: 262fdfc290504496d6f5d484a2e69bfb339a968aa112212d1dbb023937d75319
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, a common tactic for SEO poisoning and redirecting users to malicious sites. One of these links, 'https://ttraff.ru/wix?keyword=um+novo+Cristo+wallace+wattles+pdf', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, indicating the primary intent is to drive traffic to this malicious infrastructure. 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.ru/wix?keyword=um+novo+Cristo+wallace+wattles+pdf
    • https://cdn.shopify.com/s/files/1/0435/9743/0941/files/square_root_of_98_in_decimal_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/ua_gothic_heroes.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/pidatoga.pdf
    • https://static.usrfiles.com/ugd/33a2e4_2478fe15966440b6a6be4e24a2cc3f48.pdf
    • https://static.usrfiles.com/ugd/d5415a_d99a5aa149aa4ba2991cd78c89b29bad.pdf
    • https://static.usrfiles.com/ugd/271e65_6bf118bc5df948d89801bbe6449f03b7.pdf
    • https://cdn.shopify.com/s/files/1/0437/1903/2984/files/siletozubifupa.pdf
    • https://cdn.shopify.com/s/files/1/0457/5651/4460/files/best_performing_vanguard_funds_australia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fusuzirosaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2337/6277/files/woxezajojeret.pdf
    • https://cdn.shopify.com/s/files/1/0431/4130/0375/files/best_free_indesign_cv_templates.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/bevenekoxedaluxozizup.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/zapizeva.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/88232802747.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006847.bin
410e9733dc990583cdb71e4b76bbaed614af77ea9dd0cb8162add4ee23a72b01
pdf-font-stream PDF embedded font (sfnt) at offset 0x6847 5444 bytes
font_01_sfnt_off00007ac5.bin
6a7184aedb9ad88cfba23bf1b0577c05f818c9dea8738bd0afd330f8fba5e486
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC5 10380 bytes