Malicious PDF — malware analysis report

Static analysis result for SHA-256 afac5cebda64d09a…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 20:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbb9830408adae7e3625be33949ee8d5 SHA-1: 593e0d8e35f3a1651c38cdb07297402e3793169d SHA-256: afac5cebda64d09ac4f8312ecd178debc06090a066c8c84072661b95550d0c35
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The heuristic firings indicate that the PDF is likely part of a link farm designed to redirect users to malicious infrastructure. The document body contains garbled text but also includes the malicious URL and several other URLs hosted on Shopify and usrfiles.com, suggesting a coordinated effort to distribute 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/wix?keyword=a+ferin+forte
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/apel_jasnogrski_nuty.pdf
    • https://cdn.shopify.com/s/files/1/0448/5994/9218/files/29736563540.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/56537362657.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/pavamulupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/latotezigabajisototilo.pdf
    • https://static.usrfiles.com/ugd/b8c837_fde285ca2f0545b58b282b894a371ec7.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/wixat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nipexaledova.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/dizidizedum.pdf
    • https://static.usrfiles.com/ugd/625844_b74d1d7b496a449783191673516d2356.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_2f8a44c833a848618f710906d5f2be82.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e07668e1ce740638d2bf153e34a7753.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_off0000697d.bin
b96748db78b0d59841b481d291d6a3360033dd552c85710e3e9fbda08f3f0523
pdf-font-stream PDF embedded font (sfnt) at offset 0x697D 4332 bytes
font_01_sfnt_off00007847.bin
d34c1f675e3fed18b8a1d03bc1cd6fcf8c548542e749c38020cfd629c0d530e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7847 10468 bytes