Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc407f4fc83c22ae…

MALICIOUS

PDF

49.5 KB Created: 2020-08-15 00:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4f09b5f39e911dbd05b24c8043c1603 SHA-1: 48a9e84342f469f0cb6e7aea135c6c5c1995cca4 SHA-256: cc407f4fc83c22ae5e2f41cfa39784d8a41240e61c1bbb892933db8e71faacf8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'Bihar tet exam form 2019' and also includes the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to potentially improve SEO or distribute malicious content.

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=bihar+tet+exam+form+2019
    • http://files.lewinallergy.com/uploads/1/3/2/6/132696174/3350897.pdf
    • http://files.fhbcfortmyers.org/uploads/1/3/2/6/132680813/fuzogofevajul_narereweti_nuzebopowe_wenifinu.pdf
    • http://files.mindfulserenityonline.com/uploads/1/3/0/8/130874629/pezozulaleku.pdf
    • http://files.bikewritingbuilder.com/uploads/1/3/2/6/132695492/2716741.pdf
    • http://files.cardinalbeadcreations.com/uploads/1/3/0/7/130739340/levusumugelogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/r18_b._tech_cse_ii_year_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/gamuzezitupekekezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0141/files/xobumakisezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/65825799660.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/non_reducing_sugars.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6775/files/44311713063.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/dumelaxokuwef.pdf
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/augmented_reality_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7809/files/pamexetalaveduvekej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/zusoren.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/zonaxuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/75263091360.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_off000060b8.bin
c70db83d56a22b1faec5144502e1e0078d38997d70719633a5c94cc7c4f28635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B8 5396 bytes
font_01_sfnt_off000072fd.bin
1f863fd0e0091ff1e1be3b27b5fc313a4c8da4beb20fb5038e6fc876e520cc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 10408 bytes
font_02_sfnt_off0000969e.bin
6c7287389a8040c03fff3a2be3eab9f7504e3cc7b236fe38dfc4d98a9ebdd7db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x969E 11044 bytes

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