Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40e649030b36f2c…

MALICIOUS

PDF

32.9 KB Created: 2020-08-12 08:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daad53cb548d710954d39244d8cac25d SHA-1: 2bc590dc59f4914437fe7c20e3cf6ca97e8d53b8 SHA-256: b40e649030b36f2c1f3f90ef7b082106506e4e73210539afcfc7fb7dc8aeb192
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 of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning technique designed to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=listen%20here%20intermediate%20listening%20activities%20pdf
    • http://files.roseembyrs.com/uploads/1/3/1/4/131406831/9356128.pdf
    • http://files.harborhomeowners.com/uploads/1/3/1/3/131379498/8879546.pdf
    • http://files.architectinspect.com/uploads/1/3/1/4/131437161/kiwoxixivodap.pdf
    • http://files.maryellenallison.com/uploads/1/3/0/8/130815303/99551f590bcd43.pdf
    • http://files.ssjo.org/uploads/1/3/1/3/131381003/6093852.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/fofoxevabakituxi.pdf
    • https://cdn.shopify.com/s/files/1/0455/6773/8021/files/krones_bottle_washer_machine.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/zavawiwolenegig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/lakowotabuvevowo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/gawatiwid.pdf
    • https://cdn.shopify.com/s/files/1/0431/7131/5876/files/ornamental_fish_breeding_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/ropudebew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/78502725217.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/56040465587.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/95657888303.pdf
    • https://cdn.shopify.com/s/files/1/0439/9369/4366/files/54701564088.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/compound_adjectives_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/42475994854.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_off000044b4.bin
c70ed83341eda57f91d61e6d121105ba69fc741494b83eec19c73538136dd570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44B4 5572 bytes
font_01_sfnt_off00005779.bin
00c1f784f1e2528f5b240d4d7f9444f7055ee23b3f7d083fcab01184b56ec9d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5779 8964 bytes

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