Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bc7f20145afb28…

MALICIOUS

PDF

44.4 KB Created: 2020-08-14 16:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a5b7c10f7fffd4bba738bcc8f5d0d92 SHA-1: 7af2029510bbf9498859276c75fa230cbad902de SHA-256: 87bc7f20145afb28411cf02603770cba08a40bd576f50c2030b757b54b95f94b
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 redirect users to malicious infrastructure. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=australian+ethical+super+fund+performance`, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a social engineering attempt to drive traffic to 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=australian+ethical+super+fund+performance
    • http://gumaremo.michaeltmeier.com/uploads/1/3/1/3/131380213/9998364.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenipuwewof.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/91249221301.pdf
    • https://cdn.shopify.com/s/files/1/0438/5744/5029/files/73438910952.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/76528839259.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/bhagavad_gita_as_it_is_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/dokaval.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/contrapositive_proof.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1191/files/fanomakex.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/jedijuwetetiwuzasakovim.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/vipijorinikegapikofapin.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_off0000664c.bin
0947e44c886c533f91a00dd474d907011eebbef5849002527925297800f2e83c
pdf-font-stream PDF embedded font (sfnt) at offset 0x664C 5384 bytes
font_01_sfnt_off0000786b.bin
02b0499f1d0b3c27212be7c5f783a08a4644590a6a45b05e8cdaadc2eab86881
pdf-font-stream PDF embedded font (sfnt) at offset 0x786B 13832 bytes