Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ceaaa16fc2e230…

MALICIOUS

PDF

52.2 KB Created: 2020-09-02 00:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a13395622c43f963d34ec90458f0001 SHA-1: da4dc1ae40c1f802d6ea079d360dfe2df8701502 SHA-256: d1ceaaa16fc2e230ba41a33275e730a5c8e309269c14b0693a194bdfd2433611
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to the `ttraff.ru` domain, which is flagged 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/wix?keyword=relevant+costing+questions+and+answers+acca+f5
    • https://static.usrfiles.com/ugd/4725f1_a9a21ef0fe1a47a0a2d20f950261d776.pdf
    • https://static.usrfiles.com/ugd/217b8a_c1a9a47614f54814ac0bceebd657d910.pdf
    • https://static.usrfiles.com/ugd/b88e3d_45945d91d016466ea73a26780e8e91c1.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/51271509140.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/moziwobomavokufabejelurit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/berliner_platz_2_neu_intensivtrainer_lsungen.pdf
    • https://cdn.shopify.com/s/files/1/0430/8130/2167/files/locked_up_season_4_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/98644198030.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3901/files/demonawefididositegop.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/pugevabuwabusorutaso.pdf
    • https://cdn.shopify.com/s/files/1/0428/8646/3647/files/ripiwikizaged.pdf
    • https://cdn.shopify.com/s/files/1/0445/6411/9716/files/39659124085.pdf
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/gukavigifovum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/38272245416.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6191/files/free_christmas_machine_embroidery_designs.pdf
    • https://cdn.shopify.com/s/files/1/0462/7198/7861/files/45663070503.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_off0000835b.bin
60510d54b6c9c2e1de54b25ebcd4d1b0ec0f99ed5c33f86b31cf4d0d8814b96b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x835B 5600 bytes
font_01_sfnt_off00009685.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9685 1800 bytes
font_02_sfnt_off00009f13.bin
b6c7a294ba3c23628b14bc590b383e0a8b711f09f08923c7613b4c62913fe400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F13 10692 bytes

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