Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a70e5dbf553433…

MALICIOUS

PDF

50.5 KB Created: 2020-08-07 23:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a85497c3d2ea020a318d9b1199e4fc2 SHA-1: 3d083501a41388d50b8fb90d26bc2695f0b01a80 SHA-256: 12a70e5dbf5534336f881e3e9e3dc201ca137ea45ae54e9cd380c37bbca4e81a
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 redirector infrastructure or potentially malicious domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'ttraff.ru', indicating a malicious redirector. The document body, though heavily obfuscated, also contains URLs that are part of this link farm. This suggests the document is designed to drive traffic to malicious sites, likely for phishing or malware distribution.

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=tasm+assembler+tutorial+pdf
    • http://files.studio135onlinestore.com/uploads/1/3/1/4/131452903/mivobedad.pdf
    • http://files.churchesinmissions.org/uploads/1/3/0/8/130813796/falaferixewa.pdf
    • http://jegagaro.primitiveworlds.com/uploads/1/3/1/4/131437736/8608006.pdf
    • http://files.centrepointecincinnati.com/uploads/1/3/1/4/131406413/e08b8.pdf
    • http://saninef.owensbororcclub.org/uploads/1/3/1/4/131406507/6ca876.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7965/3789/files/pokemon_explorers_of_sky_rom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6058/files/2062207060.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/65409189012.pdf
    • https://cdn.shopify.com/s/files/1/0437/9302/3133/files/xulejudajig.pdf
    • https://cdn.shopify.com/s/files/1/0432/6116/5723/files/55515862825.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/92417870452.pdf
    • https://cdn.shopify.com/s/files/1/0429/9613/8137/files/90274808503.pdf
    • https://cdn.shopify.com/s/files/1/0438/5921/4501/files/95193061739.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/84213539443.pdf
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/85416174079.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_off000087b4.bin
9824c59642979818e38340c778525b35fee2f79400a632f30eaddc3aa7aeb19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B4 5276 bytes
font_01_sfnt_off00009982.bin
a49313977a2716d3310e5c1ad80fc26784b7e8b0f863e06b944d103ad9772202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9982 10464 bytes

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