Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bacbeebfaad0c7…

MALICIOUS

PDF

45.2 KB Created: 2020-08-25 01:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4078f424f020d33cacaaf84a1428672 SHA-1: 0ab8fd20d6592518d9c1b661892b435f7546f3c3 SHA-256: 74bacbeebfaad0c7abf0327076b2bdf49f9f97be4f3f760a637fddc8f8794519
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 of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=game+dev+story+direction+guide'. This suggests the document is designed to manipulate search engine rankings or to redirect users to malicious content. No scripts were extracted, but the presence of embedded URLs and the link farm structure indicate a malicious intent to direct users to potentially harmful sites.

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=game+dev+story+direction+guide
    • http://files.hairstunt.com/uploads/1/3/1/6/131606128/66de19bf6281c.pdf
    • http://files.louandlila.com/uploads/1/3/2/7/132712373/4249391.pdf
    • http://zeduvul.thewolfofwaverlyplace.com/uploads/1/3/1/4/131437549/4609358.pdf
    • http://zipejisuk.richmondbulldogs.org/uploads/1/3/1/4/131438110/d5edfa380.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/40946780431.pdf
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/chronicles_of_darkness_condition_cards.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/57480082087.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4262/files/les_carbamates_insecticides.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/nirarit.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/sagifilokifalalabenuri.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/minavalimefalire.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/95514126859.pdf
    • https://cdn.shopify.com/s/files/1/0435/1167/7083/files/az_movies_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/632585748.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_off0000705b.bin
69a9a7fb3cd91b825a25cddb5ae7069fb859e01c4738307da88a6ac309e926b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705B 5420 bytes
font_01_sfnt_off000082ca.bin
8d44a8ab47c12b3313aebcf00cf1fe3da16f5b6f7e5a6c3874951547e7614151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 11140 bytes

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