Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fd414a25bb2d27…

MALICIOUS

PDF

43.9 KB Created: 2020-08-23 18:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dbc2baa7b4622af5b9019241c89db19 SHA-1: 400b149b1493ccd3aa74a5320687815a3ca209d8 SHA-256: 11fd414a25bb2d27aba0e9bd4af0417ce13241e2b68735a62f13041727e478ce
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 Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=atmel+atmega88+datasheet'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the target URL and other PDF links.

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=atmel+atmega88+datasheet
    • http://files.coachgaryedwards.com/uploads/1/3/1/4/131438405/559238.pdf
    • http://tepuloj.carolinapca.org/uploads/1/3/1/6/131637316/6381940.pdf
    • http://files.easingwoldartex.org/uploads/1/3/1/1/131164520/7533765.pdf
    • http://gazitoxek.richfeenstra.com/uploads/1/3/1/4/131454215/soxewedulu_xunoromurato.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/7532560157.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/lokigigupozonivifutu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6487/7475/files/algebraic_notation_worksheet_ks3.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/5831694727.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/66875483776.pdf
    • https://cdn.shopify.com/s/files/1/0434/5269/4680/files/60290798348.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/wofigarojobebev.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/99516450098.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/56667755637.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_off000056ac.bin
490d8e4722c8bc70998c55e098add321fc789420233aec6e676bd50426314fa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56AC 1560 bytes
font_01_sfnt_off00005ea9.bin
2ccd15dce0f46b697ae481c914b1ab7e6ec671bf1d826514bb3f935526588550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA9 5328 bytes
font_02_sfnt_off0000709d.bin
c509d11844369492184633b9b5da44620b19e022a045b458d7f35c5f862bae97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709D 15548 bytes

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