Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15c496da6ee9ca2…

MALICIOUS

PDF

41.5 KB Created: 2020-08-14 14:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef025207e5153f3fc01979e341fc7880 SHA-1: b46ce87a0351117097059dcd78b3ed5cf60b4d4b SHA-256: a15c496da6ee9ca28ee7c12368913c8c034208fd8999bd1d26aac4b024c7b840
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.com/pify?keyword=moment+format+current+date+time. Another critical heuristic indicated a PDF link farm, with many links pointing to Shopify-hosted PDFs. The presence of these numerous links suggests a campaign to redirect users to potentially harmful 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=moment+format+current+date+time
    • http://files.cafezippy.com/uploads/1/3/2/6/132680922/5061853.pdf
    • http://files.zmagazine.co/uploads/1/3/2/6/132695602/debot.pdf
    • http://files.jeffreyingman.com/uploads/1/3/0/8/130814043/c74e4d066f5a8a6.pdf
    • https://cdn.shopify.com/s/files/1/0438/5102/2501/files/83439967120.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9237/files/cdc_malaria_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0429/1290/7427/files/87082469864.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/fepekezod.pdf
    • https://cdn.shopify.com/s/files/1/0445/4249/2836/files/lch_m_dng_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/56553399353.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/binary_search_tree_in_data_structure.pdf
    • https://cdn.shopify.com/s/files/1/0434/6652/2790/files/74349145954.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8246/files/caterpillar_416_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/fuwelaluronagafomovojewer.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/95030111289.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5903401900.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_off00006501.bin
9863b4d99170bf4d9b032b7da3e060fff562d196517a75b7a0a8ea0a9855aaca
pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 4964 bytes
font_01_sfnt_off000075ca.bin
6766f015f558ed9e58622e57b6f093e3d63540742fca955939948e528f13503a
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CA 10712 bytes