Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c58d848fc2031c…

MALICIOUS

PDF

35.8 KB Created: 2020-08-29 19:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f156fc7d3bffb4cd0cc54d0d08aef8a SHA-1: afc2a6d73dac2892a5093e0cd7bcc6eb199daab0 SHA-256: b4c58d848fc2031c9057159bbcdd2eb29c97b3e4ee3fe18ce6e8c470c818668c
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to other PDFs hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be the use of a link farm to direct users to potentially malicious content or to manipulate search engine results.

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/wix?keyword=stardew+valley+full+shipment
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/beyond_good_and_evil_by_friedrich_nietzsche.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/nikoretapogifebiso.pdf
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/yellow_flicker_beat_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2730/files/dark_souls_2_respec.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/cv_administrateur_base_de_donnes.pdf
    • https://cdn.shopify.com/s/files/1/0435/7164/2527/files/90790297896.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/napixujorezugitizig.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5384/files/topozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/jojajiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/bacterial_conjugation_transformation_and_transduction.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/sales_consultant_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/koxegepodel.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ce9d8498b841539ece29581a757d95.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cc8873b958a4a1c8d8e764c90605f5b.pdf
    • https://static.usrfiles.com/ugd/0d2908_f714f92c2bfd481ba848cb01874f5f34.pdf
    • https://static.usrfiles.com/ugd/b8c837_8992c6c61f6a4a778ae1079b6b64cb02.pdf
    • https://static.usrfiles.com/ugd/b8c837_87000054b3af4778bdd6fbae6968ec8c.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_off00004d58.bin
857f43bdf6e976a319139786b40d34f1f94e1caad6512edd8346f6b252f2eb3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D58 5640 bytes
font_01_sfnt_off0000607a.bin
306b9ba220ba6d8e95cff54b85275441fe2f7e545a3a5b8d9b32ff62804d7988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 9952 bytes

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