Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf4700a6f9a0c7e…

MALICIOUS

PDF

55.4 KB Created: 2020-08-05 04:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c7acdae47f52f38da2fe99f882dbc1 SHA-1: 77026ed60d37ea58fbb07b6587c84be42c9920a8 SHA-256: 1cf4700a6f9a0c7ee4bd61cb39c9db14dc9c43ed1dd50e221c492dc142fe305f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains the URL that is also present in the malicious redirector link, suggesting a lure to download or view content from a malicious source. The presence of numerous links, many pointing to shopify.com, suggests a link farm or SEO poisoning attempt to mask the malicious redirector.

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.ru/pify?keyword=aditya+hrudayam+lyrics+english+pdf
    • http://vomedivuk.kellermarkethouse.com/uploads/1/3/2/7/132710780/gizegixezaj_jotilipebet.pdf
    • http://files.aizhenwangart.com/uploads/1/3/1/4/131406060/pekuzaxuvud.pdf
    • http://files.clean-cooling.org/uploads/1/3/1/8/131857304/torebidifatudub-kikilu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/89789308384.pdf
    • https://cdn.shopify.com/s/files/1/0438/8261/0843/files/obelisk_risk_of_rain_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/6903/6958/files/trane_ycd_manual.pdf
    • https://cdn.shopify.com/s/files/1/0441/2522/5112/files/kokoruwofa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/vezusetijavupawukexamoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6924/files/verefupusuliduduj.pdf
    • https://cdn.shopify.com/s/files/1/0435/1010/4228/files/rizerikuloxexetoxibejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/27474687201.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/76458628441.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/rapejomilevigeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9858/files/budadixufuluwilasurep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.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_off00009267.bin
9e99cbce7eb20af45258805037563942888e63ede17ca69a37b3e1a6ac870ee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9267 5660 bytes
font_01_sfnt_off0000a586.bin
2c888edf7986838208215862d0f1684febb82c603cefed6df2824d0d160cbd30
pdf-font-stream PDF embedded font (sfnt) at offset 0xA586 13820 bytes