Malicious PDF — malware analysis report

Static analysis result for SHA-256 170a972afd85fe58…

MALICIOUS

PDF

46.1 KB Created: 2020-08-19 18:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fe8f14646cd3a29041579f257f93fb4 SHA-1: 85bdfab7f4e86a0353ef7c43eac44a53d15249a2 SHA-256: 170a972afd85fe58151728ebde11999f749477426dedb76415918214479063de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text related to making games faster and includes the malicious URL. The presence of numerous external links, many pointing to PDF files on Shopify, suggests a link farm or SEO manipulation tactic to drive traffic to malicious sites. 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.com/pify?keyword=how+to+make+blizzard+games++faster
    • http://bizepar.hermionemerry.com/uploads/1/3/0/7/130739873/6937627.pdf
    • http://sositup.sociedadlucasrd.org/uploads/1/3/0/8/130814761/6cb08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8107/1782/files/mawalutikovogeduruvuf.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3366/files/wrterbuch_albanisch_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9150/files/47445572780.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/brassage_genetique_cours_terminale_s.pdf
    • https://cdn.shopify.com/s/files/1/0429/0386/3459/files/adeptus_custodes_codex_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4355/files/noboreziwuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6656/3487/files/barron_s_ielts_strategies_and_tips_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/jezovobibiponetud.pdf
    • https://cdn.shopify.com/s/files/1/0440/0054/2878/files/gorododofusazesuzakamej.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_off0000741e.bin
924c37105fea75f4a35f93e420dc01bd5c2afbae98566f8d70e4cfc8c363285a
pdf-font-stream PDF embedded font (sfnt) at offset 0x741E 5536 bytes
font_01_sfnt_off000086ec.bin
e4257962946a60cb511c38a2e0437344999bfbb279ac035c1f822eeec313b10f
pdf-font-stream PDF embedded font (sfnt) at offset 0x86EC 10900 bytes