Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a60fd9343343169…

MALICIOUS

PDF

37.3 KB Created: 2020-08-14 20:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc0f575ba0d81c605edd21a543ec853a SHA-1: 58adde33243e6365ccb899cc7e78e6341fe565ed SHA-256: 8a60fd9343343169e6889fda6f09b9f27305470c9afec695d8100669ca37d4cc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of an SEO link farm or a redirection scheme. One critical heuristic identified a link to a known malicious redirector at ttraff.com. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern appears to be the manipulation of search engine results or the redirection of users to potentially harmful content through the extensive link farm.

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/wb?keyword=geladeira%20brastemp%20inverse%20422%20litros%20manual
    • http://files.ncnats.org/uploads/1/3/1/0/131069887/7645322.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6550/files/pametazikom.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/kilibakiroroge.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/fuzajatofusetex.pdf
    • https://cdn.shopify.com/s/files/1/0440/7656/4630/files/87947065171.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/gb_whatsapp_apk_apkmonk.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/canon_lide_220_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6293/files/69269127007.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/lirijakida.pdf
    • https://cdn.shopify.com/s/files/1/0433/5383/3637/files/sunirowubisavefokabegos.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6696/files/21630198920.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_off0000428b.bin
4d2aa87e167d704dc2925f8dd0275a757a7c89de181101c88cca058c5639d8b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x428B 5440 bytes
font_01_sfnt_off000054fc.bin
17bf7e0122ff0f8ca54760f356d227046d2b599069d62bcdbeb9cccc3c2a5caa
pdf-font-stream PDF embedded font (sfnt) at offset 0x54FC 11180 bytes
font_02_sfnt_off000078a0.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x78A0 4324 bytes