Malicious PDF — malware analysis report

Static analysis result for SHA-256 551c500b490cf8e2…

MALICIOUS

PDF

42.7 KB Created: 2020-08-19 18:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd05293c1fcb32a25984c620e0efce53 SHA-1: 218595f3b3458c1f691edf90282921648ef83d92 SHA-256: 551c500b490cf8e2859cb424f4e9aef70af7b5da6a10c137e2eec6b8fe5cadae
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users into downloading further malicious content. The document body, though heavily obfuscated, contains the same URL and references to 'graphing log functions worksheet pdf', indicating a social engineering lure. The presence of numerous external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to increase visibility.

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=graphing+log+functions+worksheet+pdf
    • http://zemej.newentorchestra.org/uploads/1/3/0/8/130874493/pelexugetuvi_rumabivirasimoj_xirilone.pdf
    • http://jizeg.healyourfinances.com/uploads/1/3/0/7/130776791/lupekavedugolevojola.pdf
    • http://files.chadeffect.org/uploads/1/3/1/3/131382841/bikowo.pdf
    • http://files.agentpgs-qatar.com/uploads/1/3/0/7/130739731/jejexabafubuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/27487132423.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1303/files/rusux.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/reformas_borbonicas_en_el_peru.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/oregon_wbf_tax.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/zevufo.pdf
    • https://cdn.shopify.com/s/files/1/0446/6363/6131/files/76049210424.pdf
    • https://cdn.shopify.com/s/files/1/0430/8133/4935/files/52750297585.pdf
    • https://cdn.shopify.com/s/files/1/0440/9019/6133/files/14588922834.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/14469593273.pdf
    • https://cdn.shopify.com/s/files/1/0435/4369/1413/files/96267663742.pdf
    • https://cdn.shopify.com/s/files/1/0429/4665/8463/files/zepirivakobezixovijipov.pdf
    • https://cdn.shopify.com/s/files/1/0452/6433/9105/files/maglev_wind_turbine_with_ppt_seminar_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/6078/8390/files/bijumenezis.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_off0000664e.bin
286972f9ec369cb8740fb19ed1032f1bbc7e9cf07a3bb86bfa7be41b39879aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664E 5604 bytes
font_01_sfnt_off0000796e.bin
069f97940f050329a6dd0e7e637606c8e17e31240e55ed661e50675b348f392a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 10684 bytes

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