Malicious PDF — malware analysis report

Static analysis result for SHA-256 a412da5e32c053ff…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 04:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef56a7f9354148dd7a6aaec1b32c1faa SHA-1: 32f1526141d8caec868976f2987b696d2f16bd58 SHA-256: a412da5e32c053ff09186b816329fa7e3ba9932a1b89e5ef21f6de8dc9ea4196
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting seemingly benign PDFs. However, one critical link redirects to `ttraff.ru`, a known malicious redirector. This suggests the document is designed to lure users into clicking malicious links under the guise of search results for 'single bed sheet sets online'. No scripts were extracted, and the document body is heavily obfuscated, but the heuristic firings strongly indicate malicious redirection.

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=single+bed+sheet+sets+online
    • http://guduvemok.stampstation.com.au/uploads/1/3/1/4/131453329/nulusiveliwavexupor.pdf
    • http://files.mastersofmasternodes.com/uploads/1/3/1/6/131606284/rofixoxemuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/irregular_present_tense_verbs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/8872/4639/files/99830909628.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/gosoduvipagoxizomuvitulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/13467501776.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/zomisegilafovefudokuto.pdf
    • https://cdn.shopify.com/s/files/1/0448/3465/2321/files/soraxijamelosazaxape.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7970/files/15774056021.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/administracion_de_recursos_humanos_pearson.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/an_anthropologist_on_mars_seven_paradoxical_tales.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1447/files/fonobusifufemib.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/vamuzuje.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/convert_webpage_to_firefox.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/12155718916.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_off00006729.bin
645b39b8e17def0aac64ac253b0999fbf5023550cab5ddb6be44d39fb965ec1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6729 5024 bytes
font_01_sfnt_off00007835.bin
20bca68ed1f43513df3ba2f411f5dc9fadc512a9ce8d4299aed4865453836fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7835 10140 bytes

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