Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6903dcc808413d…

MALICIOUS

PDF

53.0 KB Created: 2020-08-08 22:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3730e0425ff79b426791dfba6fc69c3b SHA-1: 54b6e94ffa49a7d6d230c972dc42b7d09c242407 SHA-256: cf6903dcc808413daefa31662eb8347211716bafd64bedf3cc102e0e29fd0f53
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

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/pify?keyword=ielts+vocabulary+speaking+pdf
    • http://duvoribof.protectlifeinthe419.com/uploads/1/3/0/8/130874620/watutoluziw.pdf
    • http://files.houseofaromas.online/uploads/1/3/0/9/130969440/pupipa_kakikufafumoso_getovefu.pdf
    • http://files.ironfistboxing.org/uploads/1/3/1/3/131383998/4155003.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/remove_blank_pages_from_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/vl_orion_paintball_guns.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/iso_9001_certification_process.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6341/files/jexododiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5462/files/mobisekufulivedex.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0775/files/nelutagaxagon.pdf
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/organic_chemistry_wade_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/9317/1103/files/69318325038.pdf
    • https://cdn.shopify.com/s/files/1/0433/7536/2198/files/47329645321.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/70254945183.pdf
    • https://cdn.shopify.com/s/files/1/0438/9198/2491/files/xakirafikil.pdf
    • https://cdn.shopify.com/s/files/1/0429/0271/6572/files/auto_brewery_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0445/7899/6383/files/comparison_paragraph_examples.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_off00007b1e.bin
ac82161b97c9cf68b5c662c8f4281da7346b83df0df7a9ddf8dd952388185962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 5624 bytes
font_01_sfnt_off00008e5d.bin
cc7a74b36553cb2031442aab7e9c21920e1f39ab82414b3543c79448a1a4ef38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5D 10288 bytes
font_02_sfnt_off0000b1c5.bin
d1c8684a1a3d898794fb67da7698232674cbd89070737fd881b584d0545c9aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 16120 bytes

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