Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bed2c414d030900…

MALICIOUS

PDF

39.7 KB Created: 2020-08-04 21:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4b5d5ae0435f4f6862a1fd9ed45205 SHA-1: 0081c9d87eae2df67ff695fdf171eefe2f39d46d SHA-256: 4bed2c414d0309001d208933b52293386948efa07b24cbace65b3e99f0842270
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links, https://ttraff.ru/pify?keyword=php+programming+clever+techie+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or contains obfuscated text, but the presence of the link farm and the malicious redirector strongly suggest an attempt to lure users to malicious 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=php+programming+clever+techie+pdf
    • http://files.jskarchitect.com/uploads/1/3/0/7/130776490/bopabulepedur-fezuzi-raxewuwis.pdf
    • http://files.kimicarter.com/uploads/1/3/1/3/131379343/nemavemowovupen.pdf
    • http://files.anglesborons.com/uploads/1/3/0/7/130738943/zugupufukusebudemowa.pdf
    • http://files.butterfliesandbumblebeesdaycare.com/uploads/1/3/0/8/130873922/2d9f5.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/lawiroviwuzojomuvuwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/23388393974.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/difazunenulifuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/99641963240.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3763/files/guxuzot.pdf
    • https://cdn.shopify.com/s/files/1/0435/6951/2607/files/fipekeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/51600084513.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/36296445318.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/xomuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50971407729.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8008/files/siwowopiraboxisikuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/palejofuferodewovurut.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/16645518900.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_off00005d93.bin
8389d9b1a0c6d65f32770ecb44dc5d7be3b806bf1541ce062c69752bca28ba48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D93 5452 bytes
font_01_sfnt_off00007004.bin
8bd08c0f6ec59c5ec908b65e1f376b9ff2da76e742f6e1dd9381e3ca5d9d14c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7004 9948 bytes

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