Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b66521a643528e7…

MALICIOUS

PDF

40.7 KB Created: 2020-07-31 11:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30169e0763fff40ce381c61fcd6d3cb9 SHA-1: 42a510fc3a36acdb9a827df2b5252af09d0cfffb SHA-256: 9b66521a643528e7364653d558aec114edf11868c0bb0263e8f104453650c07e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of a malicious redirector URL suggests the primary goal is to lure the user to a compromised site for further exploitation or phishing. No scripts were extracted, limiting the analysis of specific behaviors.

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=alter+ego+a1+manuel+pdf
    • http://files.constancebretes.com/uploads/1/3/1/4/131453917/niwatigotig_fabaw_gemogebida.pdf
    • http://files.xzentia.com/uploads/1/3/1/6/131606101/tubunejetuse_veziwalo_nenixisurukeko_solejumelog.pdf
    • http://files.feehanonlinestore.com/uploads/1/3/0/9/130969428/tujebajif.pdf
    • http://files.lcorelca.org/uploads/1/3/2/6/132681164/a8c53e40e7.pdf
    • http://files.mindfulmedical.vip/uploads/1/3/1/4/131407042/maxefu-lowex.pdf
    • http://files.feehanonlinestore.com/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0433/8532/3683/files/vagonegopijafijupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2159/0951/files/24521291484.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/xigerofamobixaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65817182127.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53551688275.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/sapovavoxunotameboxaliru.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/xokarudiregatutunepeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/8672192739.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8343/files/dizamig.pdf
    • https://cdn.shopify.com/s/files/1/0432/8177/6795/files/vavusetogad.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/72682785285.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/24731744896.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_off000060de.bin
1d537ac8aa3d74e5c29b4f02ca76b10b9a0fbebb7b81223684160e1dd4756bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 5056 bytes
font_01_sfnt_off000071f8.bin
4fd9afd219a696dd88dc263de1c34e6e84507057c6fd9819c7521e585c9d13df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 10732 bytes

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