Malicious PDF — malware analysis report

Static analysis result for SHA-256 438a9f6d75d0198c…

MALICIOUS

PDF

36.2 KB Created: 2020-09-01 12:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d81210ee0db4ebe94ab2542b29be3299 SHA-1: 8ef4fae8ba71fbcfd37248b311f0449a3fb0f17a SHA-256: 438a9f6d75d0198c74f977e843c80d74cd3179bd0e04c4747ef0032b1120a743
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link to a known malicious redirector. It also contains a large number of external links, many pointing to benign Shopify URLs, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is ttraff.ru, which is used to redirect users to content related to 'life management skills final exam answers'. The document body contains obfuscated text and the malicious URL, reinforcing the redirection attempt.

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=life+management+skills+final+exam+answers
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/artificial_intelligence_short_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7498/5885/files/factoring_polynomials_activity.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/moziraganipos.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/18286996218.pdf
    • https://cdn.shopify.com/s/files/1/0437/5032/6426/files/53657434674.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/42386813397.pdf
    • https://cdn.shopify.com/s/files/1/0437/1300/3674/files/open_channel_hydraulics_sturm_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7556/files/wedding_invites_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4470/8245/files/15621578997.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/stcw_including_2020_manila_amendments_2020_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1125/files/mududovedepagi.pdf
    • https://cdn.shopify.com/s/files/1/0463/1301/3408/files/resologu.pdf
    • https://static.usrfiles.com/ugd/8b9728_9516dcab319a42e8af5d8b9b7b5c4db1.pdf
    • https://static.usrfiles.com/ugd/760101_cb5110b948cb491a9440c40acafc379e.pdf
    • https://static.usrfiles.com/ugd/a107db_495029dd0ed444cc95f65f6abe8946be.pdf
    • https://static.usrfiles.com/ugd/361045_d585c6b175634f7c817af6763fa96b25.pdf
    • https://static.usrfiles.com/ugd/b8c837_30e5cc5025a64bebbebfacf31c504f08.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/
    • https://static.usrfiles.com/ugd/b8c837_30e5cc5025a64bebbebfacf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000502a.bin
9153343746a75556b9d96060feb181f7fe27978f9cd31cd2bf84316371055f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x502A 5252 bytes
font_01_sfnt_off00006210.bin
196f9f805155842084eca51309e26220385575f3dce87b5ee3ed22077c8f0723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6210 9876 bytes

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