Malicious PDF — malware analysis report

Static analysis result for SHA-256 53969ddc705d8976…

MALICIOUS

PDF

44.3 KB Created: 2020-08-20 12:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa3b5be0254f75cfcbd30f28ab4d89de SHA-1: f8507e8e5b652140f11c248fa1131a17ad5bd8f4 SHA-256: 53969ddc705d89767c707514c1c3892ddff1843ce48f5b444ec8e4f8e2874197
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=game+biohazard+4+mobile+edition+mod+apk'. This indicates the document's primary purpose is to redirect users to external content, likely malicious. The presence of a large number of embedded links, many hosted on Shopify, further supports the SEO link farm heuristic, suggesting an attempt to distribute malicious content through seemingly legitimate platforms. The ML classifier also 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.cc/pify?keyword=game+biohazard+4+mobile+edition+mod+apk
    • http://files.bronxpartyhall.com/uploads/1/3/2/6/132682731/2850261.pdf
    • http://files.christineleakeymusic.com/uploads/1/3/0/7/130775893/rirabu-tanovuxufomeda-jigakupa.pdf
    • http://xedakux.tedxembryriddleprescott.com/uploads/1/3/2/3/132303035/fb4381cce7.pdf
    • http://files.lashupbrowdown.com/uploads/1/3/1/4/131452961/netekawemogur_zitiwo.pdf
    • http://files.thefitnessmasters.com/uploads/1/3/1/3/131398292/vugutozos.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/4839739641.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/mathematics_10_12.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1863/files/68700845165.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nunirisolifugonogebivaxez.pdf
    • https://cdn.shopify.com/s/files/1/0435/0692/5720/files/barcelona_metro_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/6202/4605/files/business_meeting_agenda_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/5463/5937/files/84936898644.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/lufirurifojitela.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/refolukipokogogegepapu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/beguzipox.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/vozadiromejebefaxizujudeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/focus_on_health_11th_edition.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_off000062c7.bin
6017832a42d038a3624aa84ef193f8664e5283729f9ac1070d99c69a5e8f308d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C7 5180 bytes
font_01_sfnt_off00007443.bin
31d34166ae736f3b001d4a49e2b3543bf994d701edf64527eb47947bc3b6c751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7443 9900 bytes
font_02_sfnt_off00009624.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9624 4324 bytes

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