Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5b9db41fc8857e…

MALICIOUS

PDF

51.0 KB Created: 2020-08-03 18:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b15422f765818c350085ddaff8cfc5 SHA-1: 485abe8b5fbb9e364fd51b2079409e2d9ed2a0cc SHA-256: 2d5b9db41fc8857e33015f0bb9bddccfe9e26cbb484aa07ce2859d30781495ec
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link redirects to 'ttraff.ru', identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Acquired aplastic anemia pdf' and the malicious URL, suggesting a lure to trick users into accessing harmful content. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a malicious intent to lead the user to a dangerous destination.

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=acquired+aplastic+anemia+pdf
    • http://files.gccvista.com/uploads/1/3/1/4/131407709/veferir.pdf
    • http://files.castlehillchocolate.com/uploads/1/3/1/3/131398025/zalad_rusexefil_manigufuro.pdf
    • http://files.sshschoir.com/uploads/1/3/0/7/130775834/mogat-xadimosobujos.pdf
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/73157454155.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/15358994307.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/fuwadazexilofaxejemevop.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/biwanubolesexenosinarip.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5359/files/27329422645.pdf
    • https://cdn.shopify.com/s/files/1/0436/2731/5353/files/econnect._osfhealthcare._org_s.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/chrome_32_bit_linux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/82065124586.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0087/files/84601065859.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/80634147845.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/4chan_nsfw_gif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/fasetipowiweba.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/28314528237.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/
    • https://cdn.shopify.com/s/files/1/0431/9775/964

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088f9.bin
46afab23ebfbb9022656ccddf3bd4ec1b9f4d0d7428a2cb146778e4877efa7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F9 5416 bytes
font_01_sfnt_off00009b4a.bin
624ccf337bdfe1e8bba8b31d24304cac0f1d38c05b1d724a945f45bdb53d2c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4A 10404 bytes

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