Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf1e32badd9c078…

MALICIOUS

PDF

57.5 KB Created: 2020-09-02 07:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 192edcf950b033242446db240746bad1 SHA-1: 7d314e17f11df8fdb1376ab4489f86e91f9a45bf SHA-256: 3cf1e32badd9c07802c8ee655e407295f71df9a0518d0e1406ca7eefaa4cb1b8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a "purchase agreement format" keyword. The document also features a large number of external PDF links, many hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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/wix?keyword=purchase+agreement+format+in+word
    • https://static.usrfiles.com/ugd/493135_8e754c1a4f114dfaa91bf166e0eb8ffc.pdf
    • https://static.usrfiles.com/ugd/9904c2_49d93933118245a8ab9a1d1defe5bf94.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e555a8fb9454e799ab6494884fca9d0.pdf
    • https://static.usrfiles.com/ugd/ce14f3_0394b448c17e4a0da0423b3494e2f8e0.pdf
    • https://static.usrfiles.com/ugd/6908d7_c8fe2ab4ff6a4dca8a6eadfcc89aa708.pdf
    • https://cdn.shopify.com/s/files/1/0459/6534/4935/files/acapella_apk_pro.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/vupozik.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/allegories_of_reading_paul_de_man.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2315/files/amerex_wheeled_fire_extinguisher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/4091/3061/files/79909120724.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8122/files/85461401628.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/manual_de_ingles_sin_barreras.pdf
    • https://cdn.shopify.com/s/files/1/0435/4378/9727/files/media_player_android_code.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/2_file_jadi_satu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6142/7876/files/bowflex_revolution_home_gym_manual.pdf
    • https://static.usrfiles.com/ugd/b16523_14f033481dee4648918fbce545d9aa20.pdf
    • https://static.usrfiles.com/ugd/63d3ad_5e4371dd726d497b8579d2004a062314.pdf
    • https://static.usrfiles.com/ugd/0df15e_4bad3b13a90f4b25b4d35cab486e8225.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b16d1d4224f41dd92eab41919879f9f.pdf
    • https://static.usrfiles.com/ugd/868401_3c6dc258b7734af980ad1ce0e0edb710.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/
    • https://static.usrfiles.com/ugd/0df15e_4bad3b13a90f4b25b4d35cab486e8225

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000997a.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x997A 2828 bytes
font_01_sfnt_off0000a375.bin
0aab6b25561fbd7d3a5e93e844bd4c9db1811fe68e001f2e51c799f72be5da0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA375 5496 bytes
font_02_sfnt_off0000b60e.bin
c54feac6df25ac2f51316f7c32137e5bdf9b50f62811ed100db71d02fd35b4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 10036 bytes

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