Malicious PDF — malware analysis report

Static analysis result for SHA-256 c623d906b9eb44f9…

MALICIOUS

PDF

40.4 KB Created: 2020-09-16 11:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 112820cf31cd4151658e53b708e1db50 SHA-1: 6bac5d2f44789c2a48d2cbe54e4c9242bb5ecc9c SHA-256: c623d906b9eb44f9bf8c4139c54af4894c32f926cc2373b464f0ca86b65a4ab1
152 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, pointing to 'ttraff.me'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to PDFs hosted on Shopify. The document body, though heavily obfuscated, contains the text 'Uniform system of accounts for restaurants pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. 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.me/pify?keyword=uniform+system+of+accounts+for+restaurants+pdf
    • https://cdn.shopify.com/s/files/1/0437/7768/7701/files/diwuxojuvufematak.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1571/files/tomawojazavebilanuwezekez.pdf
    • https://cdn.shopify.com/s/files/1/0439/3032/1051/files/sokorogevepuno.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/5055938679.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4525/files/similar_sounding_words_with_different_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/ps2_emulator_ios_free.pdf
    • https://cdn.shopify.com/s/files/1/0476/5856/5798/files/34829834876.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1740/files/the_hero_s_journey_graphic_organizer_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5813/4182/files/arcai_netcut_pro_apk_onhax.pdf
    • https://static.usrfiles.com/ugd/ab922d_42a0cf894fbe499db6e94f76a7682b5d.pdf
    • https://static.usrfiles.com/ugd/8ebb60_18a5daf7260b45b9af1a1e5025f1d9a3.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_45872bcbcbe046199124ee49ca64baf8.pdf
    • https://static.usrfiles.com/ugd/cc15ef_58b7953ae3d84cbea6a74d8600823ed4.pdf
    • https://static.usrfiles.com/ugd/510a18_91ef639723bb41d8ad1a915104941365.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_off00005e7e.bin
5b4f6bd590ecac121b9f0e5e833e4dcfe2590622526bd90121458380c13e103e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7E 5360 bytes
font_01_sfnt_off000070af.bin
0159f39986cd43278b835411f78f711df2cee5572265af53ec5c9abba311a669
pdf-font-stream PDF embedded font (sfnt) at offset 0x70AF 10468 bytes