Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b78df610400b3d0…

MALICIOUS

PDF

38.1 KB Created: 2020-08-06 08:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c83ea5aba3f4e83e810fbfd156b1e4b9 SHA-1: 8ed04e55d4b65bc4369eb441b6416fadb8c6a580 SHA-256: 8b78df610400b3d0fe32b804e9c243d5760f2839ec44cd1c59e152a444f79dc2
152 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, a technique often used to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'ttraff.ru', indicating a known redirector. The 'PDF_SEO_LINK_FARM' heuristic further supports this by identifying a large number of external PDF links, suggesting an attempt to game search engine results or distribute malicious content through a seemingly legitimate facade. No scripts were extracted, but the primary attack vector appears to be the redirection via embedded URLs.

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=design+of+liquid+propellant+rocket+engines+pdf
    • http://files.jeremyclwong.com/uploads/1/3/1/0/131070196/5318067.pdf
    • http://files.kingdominnovation.com.au/uploads/1/3/1/4/131455543/xufanapamijiti.pdf
    • http://xuxoda.fsgse.com/uploads/1/3/1/4/131437601/tofozesiguxuru_zuzuvalidi.pdf
    • http://files.esskayebooks.com/uploads/1/3/1/3/131398338/pifijosogegonapeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/7697/5768/files/webster_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/zozawijabodevuwikekuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/bastien_piano_for_adults_book_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/computer_architecture_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/aerodynamic_performance_theory_for_the_nrc_vertical_axis_wind_turbine.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/bumurufobed.pdf
    • https://cdn.shopify.com/s/files/1/0434/8438/1337/files/medugokake.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9655/6191/files/44350767033.pdf
    • https://cdn.shopify.com/s/files/1/0440/5798/5189/files/91836998602.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/95548974980.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/76705544904.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/88272361310.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/
    • https://cdn.shopify.com/s/files/1/0434/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005541.bin
c84aed5e89dbbecc3e101f7636b9e9479fcd6e9f4c8e37fdd519ff2c6cae2306		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5541 5512 bytes
font_01_sfnt_off0000680e.bin
8aa0e75585207c3562b037464f0f2e6cec4dbd0281824f279fa6727491b91b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680E 10200 bytes

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