Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fa232b34579592…

MALICIOUS

PDF

38.9 KB Created: 2020-08-19 12:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37cc1a2b923b352d993dac0678209338 SHA-1: 81074dd1642e217dac1a2972a23becadeea4aaa5 SHA-256: 54fa232b345795925891036b2c18ee751af9611ec860c7268eaae54ef7ab50eb
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of embedded links, many pointing to Shopify domains, but one specifically to a redirector URL. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent of redirecting users to potentially harmful sites.

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=calibre+kindle+android+app
    • http://files.julienoles.com/uploads/1/3/0/7/130738912/lozavawimenen.pdf
    • http://files.marchemcmillan.ca/uploads/1/3/2/7/132740778/jejawagiwup-rabulefajomufe.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4379/files/advanced_actuators.pdf
    • https://cdn.shopify.com/s/files/1/0449/8548/3422/files/how_to_use_spotify_as_an_alarm.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/redes_sociales_y_autoestima_en_adolescentes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8171/2287/files/nidalee_pro_builds.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/seagate_hard_drives_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/76630180641.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/97596168158.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/69930130382.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/vejawafuposiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/busy_teacher_past_simple_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0064/2211/files/3c_toolbox_pro.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_off00005cd5.bin
2f359d8ea29fba3cf710690f6b0dacbc25f8abb215891276d29525604f4f08a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD5 4884 bytes
font_01_sfnt_off00006d76.bin
81b7030a18cedd178e1a799d11ce62cd661791a6db24fa0883fbd3568ec9027b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D76 9932 bytes