Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dafc054458ea8d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-10 01:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 092be6a18a070ff74358c1cf9bcdd0e4 SHA-1: de8897abc17a1f8e3794138535db210593d31f4f SHA-256: a3dafc054458ea8dba5ce33d3d2fe786cc53994704a2b73bc40ab0022632eabf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or heavily obfuscated, but the presence of the malicious redirector URL suggests an attempt to lure the user to a harmful site, likely for phishing or malware distribution.

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.cc/pify?keyword=word+web+graphic+organizer+pdf
    • http://files.gienekeyeshomes.com/uploads/1/3/1/0/131070459/jolunalasopaso.pdf
    • http://files.guruacademicadvising.com/uploads/1/3/1/3/131380456/jivazabe.pdf
    • http://files.islamtoyhwh.com/uploads/1/3/0/7/130776887/9898678.pdf
    • https://cdn.shopify.com/s/files/1/0428/4802/6780/files/jajexepebijanere.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/palenivazizijidibupi.pdf
    • https://cdn.shopify.com/s/files/1/0447/6780/5591/files/safolojudifipov.pdf
    • https://cdn.shopify.com/s/files/1/0449/7784/8488/files/cancer_de_pulmon_metastasis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/74896241936.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6840/files/fepexerunavuxediradadixaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/3433/7695/files/tasm_assembler_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/kejifinosijewidujonaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/83304358200.pdf
    • https://cdn.shopify.com/s/files/1/0436/9950/3257/files/arc_length_word_problems.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_off000062df.bin
3a874a744592820e624f72938aa916b36561168291fa19420b9fb6c8683a4a66
pdf-font-stream PDF embedded font (sfnt) at offset 0x62DF 5500 bytes
font_01_sfnt_off000075b6.bin
c080e5de1a5c123fb00159f16107e76a09a78462e1db0e79e102f0f226c6a9e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B6 9916 bytes