Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b54f97f1c18d6b4…

MALICIOUS

PDF

33.8 KB Created: 2020-08-16 00:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 033ceef86a9b60e7dfb91ed32d74489e SHA-1: f895494d271486787b964351a45de15906cd31f3 SHA-256: 0b54f97f1c18d6b48b99d0741ee177e98c72e37fef4b259ecbc92c149f49eb5b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=ambani+audio+songs++com'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect users to potentially harmful content.

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=ambani+audio+songs++com
    • http://zuruwube.jacobtrimble.com/uploads/1/3/0/8/130813848/nimomirimib_zupidugu_jadosakaso_xetaseg.pdf
    • http://files.ninemillionbicycles.com/uploads/1/3/1/8/131872149/9dec230e518.pdf
    • http://girizos.kravmagamacao.com/uploads/1/3/0/8/130814252/dirowanokeze.pdf
    • http://files.boyrazak.com/uploads/1/3/1/3/131379552/d9a2d298373c3f.pdf
    • http://demasevej.jaguartentsevents.com/uploads/1/3/0/8/130874376/rebasosetusu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/tafejil.pdf
    • https://cdn.shopify.com/s/files/1/0440/8757/4678/files/sakoxifutunonavusuponota.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/77637813125.pdf
    • https://cdn.shopify.com/s/files/1/0436/5844/4958/files/23465397639.pdf
    • https://cdn.shopify.com/s/files/1/0428/2050/1660/files/beginner_yoga_sequence.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/nodap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/tanka_poem_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5987/files/vibulirowijerajonuxame.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/xofazovopom.pdf
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/lixenozeduneg.pdf
    • https://cdn.shopify.com/s/files/1/0433/9980/7126/files/74792753214.pdf
    • https://cdn.shopify.com/s/files/1/0436/4373/2126/files/62401372293.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/zigunefajutaravub.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_off0000480b.bin
3d9e767df4a11917d2b1f11436c153a2a39178e12f35eb69c4a69c6eb8c986ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480B 5260 bytes
font_01_sfnt_off000059ca.bin
f333bbf4a15a19f7d79613509c549585c03f608b586830531d4f41e6d21ff3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59CA 9528 bytes

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