Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76864cab36ed64d…

MALICIOUS

PDF

69.7 KB Created: 2020-08-06 04:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3378ba2722a2f8f2abb43be27d136b9b SHA-1: a77db69681ff083eb268c8ce313fdf4853f63603 SHA-256: b76864cab36ed64d407209ede81ee7a3f64d1afdf736b53381596771f905b8d0
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is ttraff.com, which is used in conjunction with a keyword that suggests a lure for users searching for specific content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded URLs point towards a delivery mechanism for 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=calendario+serie+a+18+19+pdf+gazzetta
    • http://files.underonehour.com/uploads/1/3/2/6/132695714/fijebanevajalaf.pdf
    • http://files.ginquistphotography.com/uploads/1/3/1/8/131856518/aff9c.pdf
    • http://joriweki.myomovement.com/uploads/1/3/1/3/131398140/vafoxoxanamopu-dukamoge-vafiremakanuxu-mipog.pdf
    • http://files.creatingtolove.com/uploads/1/3/0/7/130775400/1840834.pdf
    • http://powoki.wonderlandtreefarm.com/uploads/1/3/0/8/130874218/geziji.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/chilton_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0431/1954/2434/files/sijulapurixuwu.pdf
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/xavonaduduxuzobixiroz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/zikibamelogolesibufusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4589/files/fomapirubonesizako.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/apostila_de_candomble_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/768365409.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/wejaxosufigadik.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/auditoria_externa_conceito.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1728/files/604749099.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_off0000ce18.bin
0138bd1b62a317c8e02841b6560b3421beb620bebe335fc27f429d9bd7011f06
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 5564 bytes
font_01_sfnt_off0000e118.bin
3f50949bfbdf09bdb2b45735d2b77317397f65d1b94b3f6241eb6cf76ca39640
pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 12672 bytes