Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb90434ec4265ac…

MALICIOUS

PDF

57.1 KB Created: 2020-08-03 14:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e51d1da321b8839379e3531628b8a4fa SHA-1: 306e6f78d3786fc6ea602ca41352dac06b4deca6 SHA-256: 7eb90434ec4265accad6b64cf24e3cefc4dd5e55f192ee4d7a6bc468191966d4
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits a PDF link farm pattern, with numerous external links. One of the primary URLs, 'https://ttraff.ru/pify?keyword=photolithography+steps+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, suggesting it is the intended destination for users interacting with the PDF.

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=photolithography+steps+pdf
    • http://files.omnipilates.com/uploads/1/3/0/7/130738928/nusoxaponajufo.pdf
    • http://files.naturallywylde.com.au/uploads/1/3/1/6/131637257/surerupovig_bexidafok_fefisa_jowurimimi.pdf
    • http://files.otterworksusa.com/uploads/1/3/1/4/131437351/tasegus-rekafi-zeganusisaj-jigavulef.pdf
    • http://files.farmacybotanical.com/uploads/1/3/2/3/132302973/xutitogesafa-lixoreriberexik-larowuwonubola.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/61300950207.pdf
    • https://cdn.shopify.com/s/files/1/0435/6135/3371/files/47178374898.pdf
    • https://cdn.shopify.com/s/files/1/0437/1064/4377/files/gejazejaxeku.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8600/files/silodixi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/what_is_macintosh_hd.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/9897428216.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/81702826883.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zafitizeruzu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/24434619144.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/nimaseweziju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/group_manager_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/2691/5239/files/derelefiwizuwadup.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/zujazusewopulapoxuzesapej.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_off0000a2cd.bin
84342e02c50dbe1cfdfad421d38079e1f68e4cfb6960e4545033f8a90f560b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2CD 5408 bytes
font_01_sfnt_off0000b533.bin
ee1b500cecb93c3b02aa6ea21e086998cb2eb32d60d1b6bbdf71c3fd2e71cbc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 9888 bytes

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