Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e81688039f4689a…

MALICIOUS

PDF

46.1 KB Created: 2020-08-19 23:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa4e8ecc0c688811770cb5a9310540eb SHA-1: f97e0cdd7d5d1c1ecdf9edae359dd68747d3ca3f SHA-256: 3e81688039f4689accfd887cac776a6b845c43b2afd2064560aa269ab7852227
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body and embedded link annotations reveal a large number of external links, many pointing to Shopify domains, which are likely part of a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=guardian+university+guide+2019+history. The presence of numerous links suggests an attempt to distribute malicious content or manipulate search engine results.

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=guardian+university+guide+2019+history
    • http://files.mindfulserenityonline.com/uploads/1/3/0/8/130874629/pezozulaleku.pdf
    • http://zuxuponi.scottcherney.com/uploads/1/3/1/4/131437044/a9818c3e5e.pdf
    • http://files.karenandrian.com/uploads/1/3/1/8/131871816/6511686.pdf
    • http://files.andrewanddeannafriesen.org/uploads/1/3/0/8/130813612/0740b2.pdf
    • http://vixoxe.centroluz.org/uploads/1/3/1/3/131397970/sekon-dolawabuwegew-rikekunulomex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/38217284667.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/capitales_del_mundo_por_continentes.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/57194183696.pdf
    • https://cdn.shopify.com/s/files/1/0432/5736/4638/files/49995149378.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5764/files/72598083303.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9120/files/introduction_to_network_cabling.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/algal_biofuels.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/vivatikimazavupupuvifose.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/jenotuviporejajigomata.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/d_d_5e_character_sheet_printable.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b1.bin
a48606447a865d13f25a325e8648646c6bd1e7637c9146de7f9e3d2e55451294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B1 5732 bytes
font_01_sfnt_off00008642.bin
47d25edbc8470eaa72220277e0606b3ac2e74fa76688721eb5dba66ec046a053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8642 10992 bytes

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