Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed8ef97a0c7b42c…

MALICIOUS

PDF

45.0 KB Created: 2020-07-30 20:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203623e852270cea8ba5b28103972e02 SHA-1: a9cc038569d82594ca0bd15947a31a75b0af66ea SHA-256: eed8ef97a0c7b42c3b41af8f78dbba0adff6d50bbbf51f28d3051ef015b87432
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'limfoma burkitt pdf', suggesting a lure to attract users searching for this term. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites.

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=limfoma+burkitt+pdf
    • http://files.wordsthatsell247.com/uploads/1/3/1/4/131438804/gegujixomatibu.pdf
    • http://files.marblemoonfarm.com/uploads/1/3/1/0/131070051/5e2a4951ec94a8.pdf
    • http://files.toddwyant.com/uploads/1/3/1/3/131379875/52595633fc.pdf
    • http://files.southashlandumc.org/uploads/1/3/1/8/131858287/771c02fe65564.pdf
    • http://files.sheilabrayrd.com/uploads/1/3/1/6/131606758/kuxujimoxopaja-xizavediwatubu-surerebotube.pdf
    • http://files.sheilabrayr
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/nabiwisusig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0591/files/jusamisedakawopekuxifi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/49181046108.pdf
    • https://cdn.shopify.com/s/files/1/0437/5075/2417/files/delipipe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/90996162473.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3366/files/vefusi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5053/9940/files/76205482060.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/nutuvusixivoxagomawiza.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/8687459385.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6840/files/tominefilebimogaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lubogalevomiwubojaxijafax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/dobupik.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_off000073cd.bin
794eebf3ead99f4238da454c10d6aeb861eaad0aeff88f67077eddb3e4263091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CD 4780 bytes
font_01_sfnt_off00008405.bin
b1ae728a58212bc775cc03b960ac5ae863c513652aedaf0258c0c38c9979134b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8405 10296 bytes

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