Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a010810e3bea19a…

MALICIOUS

PDF

54.1 KB Created: 2020-08-29 05:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c27e2f78ca159db753c5953df52173d SHA-1: cec1c3806872fd7f9a7757f1646784e095a6fc64 SHA-256: 1a010810e3bea19adc77d2b7a7dd89e227566be550ac36eed35338c2de432bf6
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. One critical heuristic identified a PDF link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'reading comprehension' and the malicious URL, suggesting a lure to trick users into clicking the link. No scripts were extracted from this sample.

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=reading+comprehension+upper+intermediate+pdf+with+answers
    • https://cdn.shopify.com/s/files/1/0433/8391/4654/files/31188258218.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8340/files/accounting_principles_11th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9557/files/install_java_8_ubuntu_14._04_manually.pdf
    • https://cdn.shopify.com/s/files/1/0437/2375/1575/files/best_harrison_ford_movies.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/gididimumekutibavewefed.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/99739030499.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/nursery_rhymes_ukulele_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3834/files/67169153737.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6594/files/adobe_creator_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0459/7340/5863/files/52832148578.pdf
    • https://cdn.shopify.com/s/files/1/0434/9096/7714/files/section_1_forces_within_earth_worksheet_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_65973569031d47b687af180330fcd4eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fef6998794846d1a3f7112cc3b3cd04.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_off00008a94.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A94 2828 bytes
font_01_sfnt_off0000948e.bin
8e946e63e79dba96958c82b2e9a4413440b6c5651d8ff2fbc4e8fe569ad0be93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x948E 5636 bytes
font_02_sfnt_off0000a79c.bin
7d0a2e555830522e90a12ff65a9304a2c77578ec6bd167f857f9e8ed90017523		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA79C 10156 bytes

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