Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d8831837f1160e…

MALICIOUS

PDF

121.2 KB Created: 2020-09-05 11:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbd53bed4f3f16547f5036964e7ea8ae SHA-1: 88615ba8d24e878308ac11252a523ff28ff695e4 SHA-256: 73d8831837f1160efd71103e0c1b89bf25f9f86ad106f04d71ddd50bf3cda554
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a phishing or scam attempt. The presence of numerous external PDF links further indicates a link farm or SEO manipulation tactic. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer 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/pify?keyword=genetic+engineering+pdf+in+telugu
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/f0f215_d2ca6f3381204573998cc9d58bda8ebe.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_08d6aa3825564c79aa7e426aedfc5639.pdf
    • https://static.usrfiles.com/ugd/18ee90_2933e538346441ddad2cb8ec343816b6.pdf
    • https://static.usrfiles.com/ugd/1e32c2_0cbc831b5c8e475d93874068e747125b.pdf
    • https://static.usrfiles.com/ugd/b8c837_477a9aa39b4845dcbe26f16521782329.pdf
    • https://static.usrfiles.com/ugd/a44510_8ded9382cbac41d79c67439317a89796.pdf
    • https://static.usrfiles.com/ugd/f84671_4117c1c08e2744d9b2dc2f55e6088305.pdf
    • https://static.usrfiles.com/ugd/b4609a_11fdf97fe38b46259b34e73c4f670cd8.pdf
    • https://static.usrfiles.com/ugd/11baf9_757ba9950de249119540bbedd1076e06.pdf
    • https://static.usrfiles.com/ugd/e3834b_afc42a5664cb458abb20010508615774.pdf
    • https://static.usrfiles.com/ugd/98d33d_fe6f3dd01b204b1283e918ad59e93d6a.pdf
    • https://static.usrfiles.com/ugd/90661f_693ffe6bba294c08806a9cc3d89730ba.pdf
    • https://static.usrfiles.com/ugd/909b15_c1ba8eecf75841c49e6064decb123bbd.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_83219ea2cd894743a3d6c7cf348614c7.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_off000194c8.bin
e488cfb0dd457385ce49825c33f14f01d6ec92330d2dc65d12287e3bfe913c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194C8 4736 bytes
font_01_sfnt_off0001a4f9.bin
24a4eeebb03684fb861b68913e81e99ec28f984150c132baab5ef28676b2077a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F9 10512 bytes
font_02_sfnt_off0001c900.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C900 4324 bytes

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