Malicious PDF — malware analysis report

Static analysis result for SHA-256 feda5076e8ecdbc6…

MALICIOUS

PDF

35.7 KB Created: 2020-08-12 06:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7bee08d131dfc8597d19736f957ef2f SHA-1: d82e38c740928ab85e31576e77656b52c44a1dc0 SHA-256: feda5076e8ecdbc6e922228659fee239dc4b6b0856884a6e514a6ce5c1907a78
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection strategy. One prominent link, 'https://ttraff.ru/pify?keyword=lessons+learned+cimorelli+book+pdf', is identified as a known malicious redirector. The document body, though partially corrupted, also contains this URL, reinforcing the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to 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=lessons+learned+cimorelli+book+pdf
    • http://files.bigbearsartstudio.com/uploads/1/3/1/0/131070859/suvuva-pefadedewove-wiruzesumovini-xanujaxa.pdf
    • http://files.exetertrees.uk/uploads/1/3/1/8/131872238/paxaxizekegan.pdf
    • http://files.srrlsf.com/uploads/1/3/1/3/131380868/4f04903295aa5.pdf
    • http://files.masterautolift.com/uploads/1/3/1/4/131437418/naxoxidenikul_mujurosegar_towidovexu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/modoroperezefopidewidofis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15843942414.pdf
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/81270667098.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/lilopizeviwejodo.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/apache_tomcat_tutorial_linux.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9127/files/1443480581.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/tufaxesimexofokol.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/inches_to_mm_conversion_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/ketafonudekojowadarew.pdf
    • https://cdn.shopify.com/s/files/1/0446/1946/4867/files/ball_bearing_number_and_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0447/7688/2342/files/biocentrism_robert_lanza_free_download.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_off00004db3.bin
1bc9fd1f3edcbb43c47e5fe0080a2fd47a3c38f0073d55c6ee5ab6fe79f1be2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB3 5444 bytes
font_01_sfnt_off0000601e.bin
d07eb445349ecde49158b3157336082f1671b602f1f88827e6023f823c4590f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601E 9924 bytes

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