Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38796c1c389245a…

MALICIOUS

PDF

47.1 KB Created: 2020-08-29 23:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 042719cdee8293c967c90b95a1643337 SHA-1: 21c64c4ae4c2908a6519f96b143914b74a07d8e1 SHA-256: a38796c1c389245afd98d4b3b458a5d44d41235f914f3b30e6095d10feaba17a
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL designed to lure users with a search query. The document body, though partially corrupted, contains the same URL and a reference to downloading files, reinforcing the lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify and static.usrfiles.com, likely to obscure the primary malicious destination. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=como+descargar+archivos+de+scribd+gratis
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/3338248188.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vukanuzedatijaxugevune.pdf
    • https://cdn.shopify.com/s/files/1/0462/4675/6506/files/volume_of_shapes_worksheet_with_answers.pdf
    • https://static.usrfiles.com/ugd/136d07_adce639010834e2986dc83c1128384fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_7450f0a71b8442cc90548803a306cbe0.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca669c5e18164dc7b1772e1030984331.pdf
    • https://static.usrfiles.com/ugd/b56239_cbc6a2154c21438f9a38fb4ddb3e67f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a5f2dd4af0e47188c580170f612d5ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_72335cb72fc64c1cadc803ff44cdc27c.pdf
    • https://static.usrfiles.com/ugd/70a38d_3cda748465ac44208ac921ea67d2c9bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_d29b6da89f4e451a858144568c89ffb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac91687b732644d1821dfdf29abd2de2.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4294/files/learn_python_programming_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0437/2470/1845/files/functional_cv_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068ab.bin
ceb22a51552e9616a95e3fc2df448da855729ea168770ca4d9965a263c48ece3
pdf-font-stream PDF embedded font (sfnt) at offset 0x68AB 5224 bytes
font_01_sfnt_off00007a79.bin
acca24d9966ef8c40712e5d06a17879fefa5b1d405018ec95a188e3a2c1cd620
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A79 11428 bytes
font_02_sfnt_off00009fa1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA1 4324 bytes