Malicious PDF — malware analysis report

Static analysis result for SHA-256 e847e7e484e5eea7…

MALICIOUS

PDF

35.7 KB Created: 2020-08-15 06:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3d2dbb3b64bff54533d26d7351092d7 SHA-1: a867445989aea54d370c67b5b081c5c267fa51c7 SHA-256: e847e7e484e5eea7f8cd5f55e8212a0e7d49de60d7253345c0a2cbe5922445a4
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=eal+sentence+building+worksheets, which is flagged as a malicious redirector. The presence of numerous other links, many pointing to Shopify domains, suggests an attempt to obscure the malicious destination and potentially leverage SEO tactics for 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=eal+sentence+building+worksheets
    • http://files.brightstarkids.com/uploads/1/3/0/7/130740177/xelojukab.pdf
    • http://basusuwuw.samlyonmusic.com/uploads/1/3/0/8/130874067/86f90eb3e2.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/how_to_craft_shield_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/xulomopimafejeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7472/files/kidelikusuxebizodapin.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/33902027993.pdf
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/accidentally_in_love_full_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/wabutuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3889/1419/files/97275242267.pdf
    • https://cdn.shopify.com/s/files/1/0429/5901/2006/files/xerogonifogini.pdf
    • https://cdn.shopify.com/s/files/1/0433/9993/8211/files/7896552662.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/19967632565.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_off00004e23.bin
891dc932e3f2f1cebfa595175eba880a71579e253b724b652c724bebcc1b839d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E23 5452 bytes
font_01_sfnt_off000060aa.bin
9e452cec874094f2b719c9454104d900206440199b5a590ff0bba605be2202ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 9760 bytes