Malicious PDF — malware analysis report

Static analysis result for SHA-256 4190cdfafdf6eeab…

MALICIOUS

PDF

45.3 KB Created: 2020-08-12 15:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d8969fa721a747dbdb5af98171a9dfa SHA-1: 83be8552ec605071a322e0e673092fa1c6dfee7d SHA-256: 4190cdfafdf6eeab390a4a398ee279ee8f938a57cc9ae80adaddfc1114006239
152 Risk Score

Malware Insights

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

The PDF document was identified as malicious by a machine learning classifier and contains multiple embedded links. One critical heuristic firing indicates the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=bible+study+book+of+job+pdf'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, likely serving as SEO lures. The document body contains obfuscated text and the same redirector URL, reinforcing the malicious intent.

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.cc/pify?keyword=bible+study+book+of+job+pdf
    • http://files.kingsporthorses.com/uploads/1/3/1/3/131383553/1742861.pdf
    • http://files.reddogcnc.com/uploads/1/3/1/1/131164474/827fb2f09de16e.pdf
    • http://xumefi.pvishnevetsky.com/uploads/1/3/1/1/131163930/bebuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/texakiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/fuxoparolikerugum.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/73896815594.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/39245677990.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/wordly_wise_3000_book_7_lesson_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/mudofixirexisiwul.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/jada_fire_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0447/4788/2650/files/general_ecology_laboratory_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8621/6344/files/rifaxipubeli.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/nawuzokaromiwizijin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/sonigagigejeresuxilut.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_off0000742d.bin
42eb410aad9b0e1828584c4675d77fae1468723cabd4fc03cf8f688670a9967c
pdf-font-stream PDF embedded font (sfnt) at offset 0x742D 5160 bytes
font_01_sfnt_off000085dc.bin
5f543bee04a5ffc624ca8adcb94300944b99847cd6fc736c519c695cb0a428e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x85DC 10540 bytes