Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8fe96b31d5c464…

MALICIOUS

PDF

35.2 KB Created: 2020-08-30 15:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0dae5f6732c39c7745c31bfcc9dda99 SHA-1: 61a820f63a68a242fb6700dc467fe051ae726d7e SHA-256: 9c8fe96b31d5c4645e34ae115527811338b06a06420548fa7f1dbee115a26bc7
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL, 'https://ttraff.com/wix?keyword=manual+j+residential+load+calculation+%25288th+edition+full+pdf', is flagged as a known malicious redirector. While the document body is largely unreadable, the presence of numerous links, including the malicious one, strongly suggests an attempt to manipulate search engine results or redirect users to harmful 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.com/wix?keyword=manual+j+residential+load+calculation+%25288th+edition+full+pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/k_p_name_photo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5664/files/superior_drummer_3_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://cdn.shopify.com/s/files/1/0435/9186/0383/files/nubibijowoluxowo.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_6388a728aec44fb688db41c777848d24.pdf
    • https://static.usrfiles.com/ugd/a382ee_c0a9568fa70946fca7f133d765a82def.pdf
    • https://static.usrfiles.com/ugd/76156b_a1e8ce51235d46868807566b7273c937.pdf
    • https://static.usrfiles.com/ugd/cb4a18_c879c765ea8044879854f48cd68aa6cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_847af44f1b3546cfb31964275fee38e1.pdf
    • https://static.usrfiles.com/ugd/735189_3d99d15c9f0e405c84e0d14b99611219.pdf
    • https://static.usrfiles.com/ugd/49be48_942717ff2299472582907420fc78efc6.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wekisod.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/dizulajefatazup.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/58060594740.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5783/files/megewitidafelodemegizog.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_off000048a3.bin
48dffbdd12a73ca06822787f0d1f986121941011cc8fe8393547db92ff14872b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48A3 5596 bytes
font_01_sfnt_off00005bb8.bin
7dc7ebb820b256a5790617c738aec1f39f32e93650612244d5daee6a8c9f71d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB8 11008 bytes

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