Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab317b17bf6c5abe…

MALICIOUS

PDF

38.8 KB Created: 2020-09-04 06:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f15c42e78a481b59f3b2e3c6ce5378ed SHA-1: 5b853a9a81ba68d41af244535d8bd235a56d7f21 SHA-256: ab317b17bf6c5abe656be14676e6d2a019bbf5e222d84e07ba6e50033658169c
152 Risk Score

Malware Insights

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

The PDF contains a lure document disguised as an "Falcons injury report week 12" and embeds a large number of links to other PDF files, likely to manipulate search engine rankings or distribute further content. One of the embedded URLs, https://ttraff.link/wix?keyword=falcons+injury+report+week+12, is identified as a malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=falcons+injury+report+week+12
    • https://cdn.shopify.com/s/files/1/0440/8092/2789/files/74235313750.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/39520926411.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6647/files/acidic_alkaline_foods.pdf
    • https://static.usrfiles.com/ugd/5b604d_cec4c34a2d6e4bf8af4b00e67333c99f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f9da7a8eae34e5f9772df950833587c.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/96445241642.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/23177300460.pdf
    • https://cdn.shopify.com/s/files/1/0437/6127/0935/files/33815502117.pdf
    • https://cdn.shopify.com/s/files/1/0438/4689/3730/files/building_drawing_n1_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/91344821693.pdf
    • https://static.usrfiles.com/ugd/2994dd_7c5aa804460e4b419bba880558925bc1.pdf
    • https://static.usrfiles.com/ugd/d1c05f_52044c3756e6431b8d3f1751b06138b8.pdf
    • https://static.usrfiles.com/ugd/7e6083_072c9a7f70ba45129485e92f09e60eee.pdf
    • https://static.usrfiles.com/ugd/d3758e_8a970d8b92254b8b96b1b58f13200223.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_off00005a4f.bin
f97fb1a1d290e50dce24694b95d5e33bd968b1b8a30dcf4467c6195897f12d70
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4F 5400 bytes
font_01_sfnt_off00006ce0.bin
8c972df2be7ed5ba75cfe25e8054ff6e15cb86b76ea928e59d8839f03b81c69f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE0 9852 bytes