Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8aff6da10cc797…

MALICIOUS

PDF

43.6 KB Created: 2020-09-05 22:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f45f88e8d7582ae27c56ac926bf7ca98 SHA-1: 504ce69f3797c1c5ad485341a40a1722987f59ed SHA-256: ca8aff6da10cc797c4a1540362922b399a71cc64c6f03c7f2eef9ce8ee9c445c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is https://ttraff.club/pify?keyword=osrs+ardougne+medium+diary+guide, which is likely used to lure users to a phishing or malware-hosting site.

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.club/pify?keyword=osrs+ardougne+medium+diary+guide
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/6347541354.pdf
    • https://cdn.shopify.com/s/files/1/0435/7115/1007/files/94055332009.pdf
    • https://cdn.shopify.com/s/files/1/0434/9463/7734/files/cs6659_artificial_intelligence_book.pdf
    • https://static.usrfiles.com/ugd/d162e3_839cfec99ddd467cbef11dc409fa28ad.pdf
    • https://static.usrfiles.com/ugd/5c7528_90440271196c4f99bc5e99735d7ce799.pdf
    • https://static.usrfiles.com/ugd/275374_96efd325cde74410b2dd3407d32ee88c.pdf
    • https://static.usrfiles.com/ugd/fb83f1_cb31cc4922b54f5ab5db45d7b5428bc2.pdf
    • https://static.usrfiles.com/ugd/a07927_17e8d0ff7ac1432291a117c83fa4812e.pdf
    • https://cdn.shopify.com/s/files/1/0435/0499/2421/files/39473526439.pdf
    • https://cdn.shopify.com/s/files/1/0437/2470/1845/files/62073327217.pdf
    • https://cdn.shopify.com/s/files/1/0431/5771/7152/files/camsurf_6._4._4_apk.pdf
    • https://static.usrfiles.com/ugd/0c41e7_e23d54c7f1a74b89902ea15cc57d613a.pdf
    • https://static.usrfiles.com/ugd/f3cb45_c5c365bcd6f4472b9f0751481ac04105.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/
    • https://static.usrfiles.com/ugd/5c7528_90440271196c4f99bc5e99

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d24.bin
e38fd6187e3696f44fa5e1c07d95e96494504658f9422d96fe2d4dd9f0888a00
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D24 5240 bytes
font_01_sfnt_off00007ee5.bin
e5b87ad13337472df2c0ee89ced8fa710954570429cfe0c063ea8242674dac94
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE5 10120 bytes