Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6df672f91847d3…

MALICIOUS

PDF

41.0 KB Created: 2020-08-02 21:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 003684c298360e29765d8c37eec42864 SHA-1: 8aad983e0bc5da48f79fc7803eea3d615719dad3 SHA-256: 6d6df672f91847d3495ffe16e4b89b4cb9a14991b3a9559e926405c2c3f5e097
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious activity observed is the redirection to external URLs, likely for phishing or to download further 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.com/pify?keyword=align+image+center
    • http://files.ohanahomeschool.org/uploads/1/3/1/0/131071063/97721.pdf
    • http://files.hdimagery.net/uploads/1/3/1/3/131378897/3547718.pdf
    • http://files.3dbikefit.com/uploads/1/3/0/7/130775174/rowez_sosidisosor_vawegipoguvifor_ludazekeforosiw.pdf
    • http://files.floridalgbtqmuseum.org/uploads/1/3/1/3/131379820/vuzajizax.pdf
    • http://files.debracastillo.com/uploads/1/3/0/7/130738524/misuwafirego.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/43298360737.pdf
    • https://cdn.shopify.com/s/files/1/0434/4938/5126/files/74981997923.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/xagedozopofidarafarexit.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/8291534464.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/roxevuwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/90589409975.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/polabupuduzusesoletej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/bebavatemorajew.pdf
    • https://cdn.shopify.com/s/files/1/0434/8575/7606/files/wozofibumejajaval.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a6.bin
fcda13592e28a04b8d5bbccaca2493423560dc1d6073636afff73008d239f3d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 4932 bytes
font_01_sfnt_off00007554.bin
cca37a58f15eb57964b045f59393e5d15fe1bb60eed92f98756cf484b32c0056
pdf-font-stream PDF embedded font (sfnt) at offset 0x7554 10060 bytes