Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe6af94bbe348a3…

MALICIOUS

PDF

76.7 KB Created: 2020-08-31 12:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e644d015b6a9c5b378a84c06de97d061 SHA-1: fe09a460731ff48c9d22aeb0f4d30272c1dfa54a SHA-256: 3fe6af94bbe348a3ee58bfa0fc2b41de2a7e51244f35e912e0f7c86f0159e577
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating an attempt to drive traffic to malicious sites. The embedded URL points to 'ttraff.cc', a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, reinforcing 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.cc/wix?keyword=integral+gamma+distribution
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/87039620723.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/luratifefidelukoroxezimi.pdf
    • https://cdn.shopify.com/s/files/1/0462/4767/4007/files/co-_occupant_income_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/infarctus_du_myocarde_causes.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/lumafipewopunoju.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/xotosimemojejatur.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/valve_actuating_mechanism.pdf
    • https://cdn.shopify.com/s/files/1/0433/6353/2951/files/lataxebew.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/84498386177.pdf
    • https://cdn.shopify.com/s/files/1/0437/2273/5765/files/90282597109.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/57343343447.pdf
    • https://cdn.shopify.com/s/files/1/0433/0618/8955/files/vmware_workstation_pro_15.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/99363592285.pdf
    • https://static.usrfiles.com/ugd/cac9e4_fb4ab088b9af46c19dc2c6dc891c7adc.pdf
    • https://static.usrfiles.com/ugd/97634b_3454d8773f264f11a88af737bb0ee16d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f26ee052378b49ab8788594b0c1bd47c.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_off0000c116.bin
238085f76e3653990cc975cd73acb353ef89b2d53b5348fd592c449b1f7920a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC116 5224 bytes
font_01_sfnt_off0000d2c0.bin
716ea5e5d63e685e2e200fbb66120aec59ddb1e7742ffa21d2b8a7d5702d8884		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 18220 bytes
font_02_sfnt_off00010c30.bin
44ba184a0c0c2e28e5cd2a2f4369389779822b6fcaa6c6886c509c295bae4219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C30 16588 bytes

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