Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec0c251890c929f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 11:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 455752a7f84aa73c5f62ff49e596abba SHA-1: 0cfb981527ac3db77986f313df06ce9c59a2d8e5 SHA-256: 6ec0c251890c929fd25c7ed25bbf22c10762fa0923725e74824a92323120b0e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm and another flagging a malicious redirector. The primary malicious URL, 'https://ttraff.com/wix?keyword=passive+voice+verbs+exercises', is likely used to redirect the user to further malicious content. The document body, though heavily obfuscated, contains text related to exercises and the malicious URL, suggesting a lure to disguise the malicious intent.

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.com/wix?keyword=passive+voice+verbs+exercises
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e1c2c239b7014ff582b26c71d97935ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_af9f47ef1d0647a697260afccf296c92.pdf
    • https://static.usrfiles.com/ugd/b8c837_fac4c59fa8104c24828d72295bbfbdf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9c380340e674d38b7994a786f2529dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff6e6566936a440e85a3ba496a4781d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d69e7d67fab432a97d0fad4414a40cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8333e51fbd040d286aa09d763f6a548.pdf
    • https://static.usrfiles.com/ugd/b8c837_440114f5513f4854b313b69758118795.pdf
    • https://static.usrfiles.com/ugd/b8c837_abfe37e54dff42e3aee07f00ad91b977.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76236dc6014450881049cea60c599ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_da6da2c8c9574e82accc82ae1f9ecb81.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d954e3e7ce14c37865a9b12ffd64b95.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c465caafb6245ab8528534a815fc2a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3902005ac65449fa4739ab3008de5bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2953501efc5942719788c1f851e7c787.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_dc90b5e7d1d145f6b05791067af5976b.pdf
    • https://static.usrfiles.com/ugd/b8c837_664ecd4f30c34ff683ef4edb4a17c57b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e31d2145ce634a5995cfab1fcd8bc3e9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006364.bin
552ab00ebfc91d8199b691944c71176cd42accb535f5431c419b09828d0172b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6364 5028 bytes
font_01_sfnt_off00007493.bin
d8040da305db88029e85a56b1c8cccae89f0461d2355457c00a497dd7689b375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7493 10556 bytes

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