Malicious PDF — malware analysis report

Static analysis result for SHA-256 715b8dbee404a543…

MALICIOUS

PDF

37.9 KB Created: 2020-09-01 23:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 033609967ea6bb63285fbc5014d0ed7e SHA-1: fa2caddc9a3e12911744517ace346b51687cb5bb SHA-256: 715b8dbee404a5432cdd3c9a15976b53f75ccf180d55d70d697e3697237a3d14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to a harmful site. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point to a phishing or redirection attack.

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=a+full+form+of+evs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/wadem.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/41277913138.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/wevoganem.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/5835701266.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/71275851429.pdf
    • https://cdn.shopify.com/s/files/1/0435/5643/8165/files/mathematical_physics_by_arfken_and_weber_download.pdf
    • https://static.usrfiles.com/ugd/4b874d_aa94501774ea49e8af33eebbe8d89087.pdf
    • https://static.usrfiles.com/ugd/b8c837_e86b580fbe8349aa9d21162d22d7c94f.pdf
    • https://static.usrfiles.com/ugd/e643da_a526b4f4cfa7491ab3ef1c3556350062.pdf
    • https://static.usrfiles.com/ugd/b5472a_4c6c68722db54a80abee172b2bc7f22d.pdf
    • https://static.usrfiles.com/ugd/db93e9_a330400cc9344f5c8275708669a69dfe.pdf
    • https://static.usrfiles.com/ugd/89c6ad_624174d5159f4fba804abf3844a0511c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3fad402974c48eda4ff995286b5a2a6.pdf
    • https://static.usrfiles.com/ugd/93c935_85831a2ead0b4085a516a26c7d53ce03.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_off00004ba7.bin
0ce2ca831bfa8a27bd0c9501c2337a70780c27967c53e534780af4fde742763a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA7 4400 bytes
font_01_sfnt_off00005a9d.bin
c366c370e7cfad0714d1c58e4b79abd6fa50a5794e0ec3bf91d13ee85258aa11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9D 9996 bytes
font_02_sfnt_off00007cdc.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDC 4324 bytes

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