Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73a691635dda554…

MALICIOUS

PDF

47.2 KB Created: 2020-08-14 19:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60b2c4aa1810e9b5a1cc535564471e7 SHA-1: b93a62392b30cfd0978919a5517e15037053df4c SHA-256: f73a691635dda554740802bf11d1d77e072e71063b9adb96caf1a6ac6b402414
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=dell+optiplex+7050+tower+desktop+computer+datasheet', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a Dell Optiplex datasheet, suggesting a lure to encourage clicking the malicious link. 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.ru/pify?keyword=dell+optiplex+7050+tower+desktop+computer+datasheet
    • http://futigazid.paigedevelops.com/uploads/1/3/0/7/130776760/9203423.pdf
    • https://cdn.shopify.com/s/files/1/0429/1333/3411/files/demonstrative_worksheet_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0436/0175/6323/files/ea_sports_game_face.pdf
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/ruvovumodonogol.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0124/files/98863750910.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/gesukedutemikiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/calabozos_y_dragones_manual_del_jugador_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0438/1691/1010/files/zilonojuzavelugaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8980/5983/files/4232193282.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_off000078bf.bin
9dc05dba606955ebd533c5d37243c778e1cfcb2c475fdf74cd68fb254e02450c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BF 5880 bytes
font_01_sfnt_off00008cc3.bin
3a045f54257f22c90fa84e6d40d243f94992e39fa0314ba82f692cf6f708da12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC3 10324 bytes

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