Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fff0e358e86ec1…

MALICIOUS

PDF

82.7 KB Created: 2020-09-12 12:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19135f1e0301c3659eefe362383cf145 SHA-1: eb92f69a953bab8651f31470a081513c53996761 SHA-256: 48fff0e358e86ec1c501b8e300b877038999dbb7d95d4244dd275048360f4bcd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary malicious redirector being https://ttraff.ru/wb?keyword=glomus%20mosseae%20pdf. This indicates a link farm or SEO poisoning attack designed to lure users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=glomus%20mosseae%20pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/basic_laws_of_electronics_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0458/5976/6425/files/design_background_powerpoint_2007_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/fallout_4_mod_load_order.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/firered_rare_candy_cheat.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/jitulekoruw.pdf
    • https://cdn.shopify.com/s/files/1/0436/1161/9491/files/gufosejuzenuji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/pdf_to_word_converter_free_version.pdf
    • https://static.usrfiles.com/ugd/510a18_b318db3d75114229a8d0c145d6773b7d.pdf
    • https://static.usrfiles.com/ugd/05301a_cbbd2ed2609e4bd0a189fe4a67189b19.pdf
    • https://static.usrfiles.com/ugd/510a18_06e45db429d94aec9083acdab3e8425d.pdf
    • https://static.usrfiles.com/ugd/afe78f_f8f2a31aa88f40e6938a9b46e384e4f9.pdf
    • https://static.usrfiles.com/ugd/270e53_6f5d8059134145bea82e85bb8ed9912c.pdf
    • https://static.usrfiles.com/ugd/3aca14_1bea5734e3074b31b868e3e34e09994f.pdf
    • https://static.usrfiles.com/ugd/a4e402_fbae20831b0a42fdb1e7d11cb14f3d88.pdf
    • https://static.usrfiles.com/ugd/dcf311_181facd9d37c43fb892de5d84d0a360f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb33.bin
500be23c916ff7c31fe58167fa1a898b0711283e3b06c4f207ff777b29c41acc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5120 bytes
font_01_sfnt_off0000fc94.bin
9767f3791df470d29fec40f3341f4faec78df61708ba4b1544506ff18f9089cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 13808 bytes
font_02_sfnt_off0001289f.bin
6d9ddf713b130202d60aac7c25d91f483ff7b867a7fd07e642abbb74800ff7d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 16228 bytes