Malicious PDF — malware analysis report

Static analysis result for SHA-256 f799357d013b1203…

MALICIOUS

PDF

41.2 KB Created: 2020-08-17 17:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7950bad19fdcbd589c7d4d6c8860ae0 SHA-1: d0cf79d48d4543727626833ccb17e357c5ce9a66 SHA-256: f799357d013b12036f936c496635f2e82afe41c060c0ea42d38db38b1237489c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=cheap+4g+android+phones+sim+free', is designed to lure users with a deceptive offer. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on Shopify. The ML classifier strongly indicates 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=cheap+4g+android+phones+sim+free
    • http://files.petermichaeldavison.com/uploads/1/3/0/8/130813982/bokavifurenis.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/20910427931.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/39470578388.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3457/files/nopoxatezobez.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/lee_reloading_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/58223895364.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/gatijejibadok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/amoksisilin_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/fogorore.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/como_convertir_un_archivo_a_word_editable_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/vinerewowilanudizodez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3808/0167/files/32369059770.pdf
    • https://cdn.shopify.com/s/files/1/0451/1134/5305/files/fuzomexuberisa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/arabia_felix_book.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_off000061ea.bin
b37da1ff3b68389aea642d196b99b7d029e8b0612136af24c05912e7c00bf783
pdf-font-stream PDF embedded font (sfnt) at offset 0x61EA 5416 bytes
font_01_sfnt_off0000742e.bin
385baef6155040997f83c5c785b2f7efb92da09664054f9f74cc061667a00fb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x742E 10596 bytes