Malicious PDF — malware analysis report

Static analysis result for SHA-256 c731f1cbf8593898…

MALICIOUS

PDF

57.1 KB Created: 2020-08-19 01:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb794108d41ca6ef566641b67ab3676c SHA-1: 2e6fdbc61513268bcef74e2912fc0fdcaacc9cf9 SHA-256: c731f1cbf859389819a659e9c63abc5d00bd3c28f0087b8be35b016a2a4f10ac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the redirector URL and several other URLs hosted on Shopify and other domains, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern appears to be a redirection chain to a malicious site.

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/pify?keyword=anbe+peranbae+status
    • http://files.packerintersections.com/uploads/1/3/1/4/131407292/migagef.pdf
    • http://mopiwug.ccvcri.com/uploads/1/3/0/9/130969723/pufoni_momirojatirujob.pdf
    • http://files.medinaguitars.com/uploads/1/3/1/4/131453054/towisiturupiv_pisufidorer.pdf
    • https://cdn.shopify.com/s/files/1/0438/3624/4118/files/46024313995.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/48874899993.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/kijiwelefenaxezurofobega.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/4538932111.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/99845191011.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/ganopitemog.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/99579495017.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/butabeligenuvuje.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/bosch_avantixx_dishwasher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/epidemiologia_diabetes_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0432/5474/3200/files/already_yet_present_perfect.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bf3.bin
1862429f34470d7b85198fbf251dc2c1cc5e069bc6778790e6da7dba38af6cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF3 4908 bytes
font_01_sfnt_off00006c9d.bin
e25551e204121ff506f36763a9847d3b3a077ec57743c311a675f3eadb573a01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9D 2968 bytes
font_02_sfnt_off000078e2.bin
cdfb43a482b41c5ad467857f395b43fe5352fbb6c2cbf181a728c0a757a1e73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E2 3848 bytes
font_03_sfnt_off0000874c.bin
19eb8adffad69ba55f83144313d14058494d8bd91a61b41d553983704e3dd1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x874C 2732 bytes
font_04_sfnt_off000091c7.bin
f81055a485c81e741e3f5f032a1b0492f7a66305802ecbf57f0a37d2f2638401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91C7 14740 bytes
font_05_sfnt_off0000bfb4.bin
8e93bc7d6580a00035938006fd50e04573cea9c219f32271d36ab8019b7bf263		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB4 16656 bytes

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