Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bde6ffd9d01401…

MALICIOUS

PDF

36.4 KB Created: 2020-08-10 04:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b42244eb5aea26867c9729585b0b3d SHA-1: 9df8aa7ac9f7b98549f87b70d9b070a32e3007b4 SHA-256: f9bde6ffd9d014015b48d682c3712e5f2a0fda94d1f2ff786a2194842fec4f60
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=business+communication+process+and+product+6th+edition+pdf'. This URL is embedded within the document body, disguised as a link to a business communication textbook. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains. The ML classifier 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.ru/pify?keyword=business+communication+process+and+product+6th+edition+pdf
    • http://rajefuza.3realms.ca/uploads/1/3/1/0/131070792/vasudelawis.pdf
    • http://files.southbeacharts.org/uploads/1/3/1/4/131437074/xuxipodu.pdf
    • http://files.mdofirstrosenberg.org/uploads/1/3/2/8/132815791/a0ab80f9122e.pdf
    • http://files.wymtn.com/uploads/1/3/2/8/132815190/vovaketitorederi.pdf
    • http://sixisex.oulgbtq.org/uploads/1/3/1/4/131437657/kowomadad_bovewugefovo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2915/0368/files/puda_building_bye_laws.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4337/files/xutimepinatafozofur.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0604/files/73266044955.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/sujet_type_bac_maths_terminale_s.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/xuzozak.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/tinupawe.pdf
    • https://cdn.shopify.com/s/files/1/0444/3848/7206/files/all_decenders_seeds.pdf
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/animal_sounds_list_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/38703142758.pdf
    • https://cdn.shopify.com/s/files/1/0437/9977/3341/files/english_story_for_beginners_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2369/files/39768105651.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4812/files/gatikamobezodaluzopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/dikikifepojetekofodivot.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/java_immutable_class.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_off00004fab.bin
7a2b9a6df70bbd46190b13a0aa2055b184314069ee477135e911a003f4ce51b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAB 5568 bytes
font_01_sfnt_off00006270.bin
529457dd05660a48d0b54d76e07a30b8bc92e57ca41b5aa4b01e66ddb9832f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6270 9848 bytes

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