Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57c3e6020e4d0df…

MALICIOUS

PDF

56.6 KB Created: 2020-07-30 03:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22220fd1d12de1d551a4ed9cf46ef332 SHA-1: 58ffbb98b00b586159e725560aa16d91b9f9b231 SHA-256: a57c3e6020e4d0df0676c4c6591e8eb52dbdd9f4409b3e8e3a50f57d37369cf0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for 'Surah yaseen full pdf in tamil'. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering through deceptive links.

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=surah+yaseen+full+pdf+in+tamil
    • http://files.charlottecountyoutreach.com/uploads/1/3/1/3/131379951/d8e822.pdf
    • http://files.vintagepercussionsoundeffects.com/uploads/1/3/2/6/132682022/4136757.pdf
    • http://files.brackinbladesforge.com/uploads/1/3/0/8/130874161/de68c4066f6ff6.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/91802688127.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/96743842999.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/fidanegugomonuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/muripafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2023/files/75005319344.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/bijugigejamisem.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/51690335889.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/wuwalubolikov.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/lemomibomipur.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/lolesafilis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/goguviduxexikasutumi.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://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerot

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087ce.bin
04e1d8adba69789c3e54aec0325506ecf05109234abcd45eb4267c129aee8d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CE 5260 bytes
font_01_sfnt_off0000997c.bin
341249ee105986524fb3127e3acbbcee067c10a6227bc91acf47b83e8211ae74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x997C 11012 bytes
font_02_sfnt_off0000be94.bin
4e08d3b4ac75695c5c0a916ff5d2e8849622795c6030180c82339a8ece964255		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE94 16324 bytes

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