Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e73d48ad6901d6…

MALICIOUS

PDF

51.3 KB Created: 2020-08-06 01:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e039f01e9ef62a6b449fd3168ef1e0e SHA-1: f14d417bf99b8b8a051b56cfc8004051b3538aef SHA-256: 33e73d48ad6901d6011f3d15a47f1f7f4d7483e85581258dea138983d0f6b821
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=afcat+2020+exam+syllabus+pdf'. This URL is presented within the document body as an exam syllabus, suggesting a social engineering lure. The PDF also contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, indicating a potential link farm or distribution network.

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=afcat+2020+exam+syllabus+pdf
    • http://files.independentorganicservices.com/uploads/1/3/2/6/132695416/wasawuw_zavofojaba_gagejoxas.pdf
    • http://files.controllerspages.com/uploads/1/3/0/8/130813851/841564.pdf
    • http://files.wybntv14.com/uploads/1/3/1/4/131438557/fafijoludime.pdf
    • http://files.abtc2018.com/uploads/1/3/2/7/132712206/jonanomeliwoxivepoji.pdf
    • http://files.boardgamesau.com/uploads/1/3/1/3/131398367/zizaxilodipiku_mewumasawuxun_valavi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pujofupokutesigitugut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/bezawuxixogijewized.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3282/files/72145652669.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/35265462007.pdf
    • https://cdn.shopify.com/s/files/1/0432/6123/1262/files/tidisexuxomogulip.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/xusifawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1224/4134/files/matakazisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29331550606.pdf
    • https://cdn.shopify.com/s/files/1/0436/0713/0270/files/minecraft_roots_2_fairy.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/php_display_images.pdf
    • https://cdn.shopify.com/s/files/1/0431/2530/9604/files/wuromefunelepedupir.pdf
    • https://cdn.shopify.com/s/files/1/0435/8642/0893/files/47355099291.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/33933628844.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb5.bin
e73fe02de33fa81a288240fb9274f96578bea4190fb6c64b9fbca7396e88c24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB5 5776 bytes
font_01_sfnt_off0000835d.bin
c30c5a065f84b5f662933d7609ea9d16a685516730bce914ce64ca11698c35ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x835D 10540 bytes
font_02_sfnt_off0000a74b.bin
d0644663986ebbb812f7c2ba20ce6348cfa331a3ca32e70c41a12a21f1cf199f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA74B 17200 bytes

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