Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a2cf8730854f2…

MALICIOUS

PDF

40.5 KB Created: 2020-08-01 18:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb6b3fab25b05f1f4fd1adf889c8f740 SHA-1: 155b6d4e68f88c4628c3e6019843f4842fb4d07b SHA-256: 3f8a2cf8730854f2c16e609aefd4f09b3d9b82b1e730ebd1b8a53625c0cad7d2
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=mp4+to+amv, which is flagged as a malicious redirector. The presence of a large number of links, including to shopify.com, suggests an attempt to manipulate search engine results or to hide the true malicious destination behind a seemingly benign link farm.

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.com/pify?keyword=mp4+to+amv
    • http://files.westfordregency.com/uploads/1/3/1/3/131398010/3228959.pdf
    • http://files.athenianenterprisesllc.com/uploads/1/3/0/9/130969211/degolodawan_xugulomadukadu_pumipemigupoj.pdf
    • http://files.davidmaycock.com/uploads/1/3/0/9/130969172/8680093.pdf
    • http://files.solanaenergy.com/uploads/1/3/2/6/132682039/8526103.pdf
    • http://files.socommunitygarden.org/uploads/1/3/1/4/131437246/6912292.pdf
    • https://cdn.shopify.com/s/files/1/0438/0724/4450/files/34306513080.pdf
    • https://cdn.shopify.com/s/files/1/0431/5919/1712/files/tavutiniviwawodidemotodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/57599972595.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/zuteligoxir.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/libate.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/67978240970.pdf
    • https://cdn.shopify.com/s/files/1/0428/8774/1607/files/xerinufuxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/xbox_one_buttons.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/zenafug.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/lozuzafafamimarogiwezeri.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/gijewuruwatabefe.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_off0000631c.bin
9bf73ef5761df47422bdc560d7bf1419ace1b8aa6e95f6b120bb94001299cb54
pdf-font-stream PDF embedded font (sfnt) at offset 0x631C 4812 bytes
font_01_sfnt_off00007382.bin
6d0537f46e7bb7a383bb3dc64fc85f187c39485221b776a01bc45deafba50c29
pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 10000 bytes