Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1486d2148d6f63a…

MALICIOUS

PDF

39.6 KB Created: 2020-08-21 08:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2bbaea24986ed1797e02a0d78527962 SHA-1: 6a485fbabaa71dc7ede7e37f1a284c7d73029d58 SHA-256: a1486d2148d6f63a46d8098d8d845222598b4324a494e49b7214b14272dbafb2
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external PDF links, characteristic of a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=lindor+truffles+flavor+guide, which is likely used to funnel victims to further malicious content. The document body contains obfuscated text and URLs, further supporting the malicious intent.

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.com/pify?keyword=lindor+truffles+flavor+guide
    • http://difimeje.tzevang.com/uploads/1/3/1/4/131483044/b9cba6.pdf
    • http://files.dianeperell.com/uploads/1/3/0/7/130738596/7381900.pdf
    • http://giwamuj.dreamhomestagingllc.com/uploads/1/3/0/7/130775934/kokisakosa.pdf
    • http://bekev.ceso.on.ca/uploads/1/3/1/6/131607321/2d173af7ef897.pdf
    • http://tunafako.andaluciahome.com/uploads/1/3/2/6/132682076/d44cf822a198.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/raperudotametodajod.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/22647137689.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4437/files/paulo_coelho_libros_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/agamemnon_script.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/berlin_public_transport_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/20629598762.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/30306269474.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7957/files/vakuwixekasesodunezunuki.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/61774511159.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevimofurerofujasopam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/16203769102.pdf
    • https://cdn.shopify.com/s/files/1/0449/5812/2139/files/5e_shape_change.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_off00005e14.bin
fd3558e7473f4effc8dd96061af3ded0801d6313d7c7a266da6f65d43c30073b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E14 5076 bytes
font_01_sfnt_off00006f6f.bin
2656cdaae1b959e14850333c85906f5a0dfd95e6ed7ec0925ff745adabb7b467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6F 9884 bytes

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