Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6c760fb94c4ff0…

MALICIOUS

PDF

37.8 KB Created: 2020-08-04 06:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ade7d550ef2f35e242278699946ef1e SHA-1: 843f0663e90ad58c087203629752b6d20a7f9c5f SHA-256: 5e6c760fb94c4ff0255016cc7d0bc329b70d1529f94e70cbd629d87cebbfdcc9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass of external links, with one prominent link to `ttraff.com` identified as a malicious redirector. The document body, though obfuscated, contains text suggesting it is a 'teacher's book pdf' and includes the malicious URL, indicating a lure to a potentially harmful site. The presence of numerous PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.com/pify?keyword=activate+a2+teacher+s+book+pdf
    • http://xemuz.thebravecreative.com/uploads/1/3/0/8/130874232/32ef90.pdf
    • http://files.dancemastersinternational.net/uploads/1/3/1/3/131384424/viwonutifin.pdf
    • http://sezuk.rootedlifecoach.com/uploads/1/3/2/6/132681394/muwerunomin.pdf
    • http://files.dishndames.com/uploads/1/3/0/7/130738719/sawokifode_xikiwoxupino.pdf
    • http://kezur.singletonwa.com/uploads/1/3/1/4/131482853/tabewuwob-xekojobidiloka-zobutinegafo-zepuvokopomagif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/midas_m32_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/0554/0509/files/34598594118.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/64317236919.pdf
    • https://cdn.shopify.com/s/files/1/0437/2509/5062/files/waronetigepabekoxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/wokafukalo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6290/9335/files/laerdal_airway_management_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wirokole.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/74995129996.pdf
    • https://cdn.shopify.com/s/files/1/0434/5485/7369/files/81547504478.pdf
    • https://cdn.shopify.com/s/files/1/0430/2392/5402/files/lovatuki.pdf
    • https://cdn.shopify.com/s/files/1/0438/9352/2587/files/25241323813.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5842/files/principles_of_assessment_in_medical_education.pdf
    • https://cdn.shopify.com/s/files/1/0429/6605/7116/files/28136093745.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000549a.bin
0aefa705d784b1020c8ecaec3b5359703f90d7bc33ca5da0c5d93b332586e2ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549A 5596 bytes
font_01_sfnt_off000067a6.bin
cad90853fb32a63a45acf35fdbd36b5fd3f3d645ea8d56c0269cc379522e6969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A6 10088 bytes

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