Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16e8ecce4c02919…

MALICIOUS

PDF

76.7 KB Created: 2020-08-04 02:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb425550c8d56c1b1604a304126cc2d SHA-1: e9584ceacb758c522bdf41ec166303fc1f0c48ce SHA-256: a16e8ecce4c0291944a0dc9d907e47f60b729de5fe828210b23c8a6856c38093
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure for users searching for 'axiomatic set theory pdf'. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=axiomatic+set+theory+pdf
    • http://files.alpinenaturecenter.org/uploads/1/3/2/7/132740905/lodutelojirageb.pdf
    • http://files.spiralofaccountability.com/uploads/1/3/1/6/131606165/dapuwifozivutuf_fewifib_godefamiguba_nejeso.pdf
    • http://files.ess-inc.com/uploads/1/3/2/6/132695517/9583906.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/hidden_object_games_247.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/saints_row_2_gentlemen_of_the_row.pdf
    • https://cdn.shopify.com/s/files/1/0439/6626/7550/files/how_to_upload_emotes_on_twitch.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/58525281927.pdf
    • https://cdn.shopify.com/s/files/1/0430/8202/3061/files/89882600824.pdf
    • https://cdn.shopify.com/s/files/1/0439/3123/8568/files/kiwoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/15600941610.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/gufibizatumafamiwifekan.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/veterinary_infectious_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/summon_command_generator.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/dictionnaire_juridique_franais_espagnol.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/dilebesemawosudijotilus.pdf
    • https://cdn.shopify.com/s/files/1/0436/1266/8066/files/61802516988.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_off0000cd82.bin
7434265f99791203bb05113742e7f7da772f6fbb0073360b24549d5a95e570b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 5520 bytes
font_01_sfnt_off0000e026.bin
0d11a799f52c647a17c0f7ee49b75f023d2096668e9a9006bb4b0bb93dba1e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 14016 bytes
font_02_sfnt_off00010cba.bin
1853bfdef37e323ee65e94939b5624a2ac264103256660beaf9e6752c6031734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 16984 bytes

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