Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cd898640a35b78…

MALICIOUS

PDF

37.6 KB Created: 2020-09-07 22:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fab617797139078af6f6509b050c3dc SHA-1: 863c68c8a555068b0ea5f21c4c7ee9783ed25c85 SHA-256: 87cd898640a35b7841672934c362d32d176c03b96239229df5c28ead78328726
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, disguised as a guide for 'osrs mining gloves'. The document body and embedded URLs suggest a link farm tactic, likely intended to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=osrs+mining+gloves+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/animal_coloring_sheets_for_toddlers.pdf
    • https://cdn.shopify.com/s/files/1/0437/8797/6864/files/baadshaho_movie_video_song_bestwap.pdf
    • https://cdn.shopify.com/s/files/1/0438/2723/2918/files/93455833315.pdf
    • https://cdn.shopify.com/s/files/1/0433/8686/3783/files/woranoketewo.pdf
    • https://static.usrfiles.com/ugd/53cfc7_75ef930df48740439059dfcb3a9c3b77.pdf
    • https://static.usrfiles.com/ugd/ce5d00_57836b23601a4120b5b4b7603cad662a.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/kidarur.pdf
    • https://cdn.shopify.com/s/files/1/0463/3952/2717/files/pixajaxijujutuwiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/ledixomuxejeka.pdf
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/xomeguzaregomijijanaxezan.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049ea.bin
af98808eca4193c777812cbc0b5825773c5548c4c66622d82c7d473b473dea63
pdf-font-stream PDF embedded font (sfnt) at offset 0x49EA 4824 bytes
font_01_sfnt_off00005a2c.bin
ea715930bec02f823a0edac54a2bb7ef9004c72ab80c95c81a4828c881254d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2C 9896 bytes
font_02_sfnt_off00007c06.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C06 4324 bytes