Malicious PDF — malware analysis report

Static analysis result for SHA-256 98534b517d74a12d…

MALICIOUS

PDF

47.8 KB Created: 2020-09-07 05:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa712a28805c4dcfd97d3ce685d0c85e SHA-1: 10e8502a246e34d3dfb8d3666d6e12b8aaccedbd SHA-256: 98534b517d74a12d1f5f45c5f50bfa702ebd63c26e1e697d656e900a3b295969
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=bird+tattoo+template'. This link is presented within the document body, likely as a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=bird+tattoo+template
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/liwukepurenugiweda.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/wings_of_fire_book_in_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0818/8839/files/95691908114.pdf
    • https://cdn.shopify.com/s/files/1/0462/5802/8693/files/kesuvadebimebikofeta.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/xikav.pdf
    • https://cdn.shopify.com/s/files/1/0457/6765/5580/files/rafeda.pdf
    • https://static.usrfiles.com/ugd/93c935_f4c6ae5dee8e4c998ec565aab1d3bce5.pdf
    • https://static.usrfiles.com/ugd/f14cf6_902c234199204d76a601fdd9b51b8737.pdf
    • https://static.usrfiles.com/ugd/704f6c_6886557f719b4bdd933cc312e68209e2.pdf
    • https://static.usrfiles.com/ugd/a18aa6_12df60405a354b67a058356eb2e54025.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/pavowefowagusimipig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.pdf
    • https://cdn.shopify.com/s/files/1/0436/4346/9974/files/didikakobapepimabevo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/87167453485.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_off00007f95.bin
06b4aa3b213aaeaf7943006113d49bb18c69de8ae57225b1cca2c78f2dc94bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F95 4976 bytes
font_01_sfnt_off00009064.bin
44a8f0d1a943622d402f0d25b3b66e57ac31420f3400fbcd0b141706007b62a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9064 9956 bytes