Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e085963a4cd5fa…

MALICIOUS

PDF

39.6 KB Created: 2020-08-21 08:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 043a44bbf7d016bd5815b717cc6256c3 SHA-1: 7f9142eba65fee559e4e00051fb766f7cb474ee5 SHA-256: 79e085963a4cd5fac658c50ae990bcf59d652189d49823e706aff10aeb43530d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a "correct punctuation sentences worksheet" lure, which is a common social engineering tactic. It embeds multiple links, with one identified as a malicious redirector pointing to ttraff.cc. The PDF also features a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution attempt.

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.cc/pify?keyword=correct+punctuation+sentences+worksheet
    • http://files.hillviewchristian.org/uploads/1/3/2/6/132682210/xofovagez_vadeluboxovo_modimet.pdf
    • http://files.pkapresents.com/uploads/1/3/2/3/132302919/8370776.pdf
    • https://cdn.shopify.com/s/files/1/0435/2901/1359/files/adobe_reader_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/19713689982.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/apdcl_recruitment_2020_assam_advertisement.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2995/files/98637035370.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1103/files/xivojijisabefitamelumax.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/derivative_calculator_using_formal_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3695/files/54922591642.pdf
    • https://cdn.shopify.com/s/files/1/0431/0401/0389/files/widutaxokobijofunaguwe.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_off00005dd9.bin
fc6fb821540c92163bf23fba2fec009ae785435497f61c419bf78c1af37fef91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD9 5048 bytes
font_01_sfnt_off00006f0d.bin
c74183ad47c4e2aeebfc3c62eb0c5e09bc0a578d1bb30de98dec6f8e14444fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0D 10288 bytes

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