Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1945dc96950f1c…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 23:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc5be043b80af0817e983e7bbd5d9a09 SHA-1: 596c4b25f63b3c944dbb567502c044c3dc0289ac SHA-256: 3a1945dc96950f1c31a34741c317f3fc427ec0334c4bbaef2b29a8156da29a9b
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 external websites. One critical heuristic identified a link to a known malicious redirector, and another flagged the document as a link farm. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. This suggests the primary purpose is to redirect users to malicious infrastructure.

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.cc/pify?keyword=easy+trumpet+solos+pdf
    • http://dupovo.spikemclarrity.com/uploads/1/3/0/7/130738948/muxujerimimenoga.pdf
    • http://gevawud.bychoicewellness.com/uploads/1/3/0/7/130738647/xajijevev_kafive_tipukax_balusu.pdf
    • http://lapitaji.johndinser.com/uploads/1/3/0/7/130740082/6211819.pdf
    • http://dodeli.stephen-watson.com/uploads/1/3/2/8/132814930/xiwuke_gufigivofol_zubejadalefuje.pdf
    • http://bawibupi.lamarnhs.org/uploads/1/3/1/1/131164250/godoma-tigudopufof-mubon-ramisesefadu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/mabilasega.pdf
    • https://cdn.shopify.com/s/files/1/0440/8311/8232/files/pebinabaraxapuvo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0886/6974/files/rune_of_teleportation_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0440/5772/3030/files/8239655489.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/paduxijudageveni.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/94808299123.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/95859520152.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/lusewojakura.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/rirozaxirubexumufeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/3184/5271/files/57510602946.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/47135050864.pdf
    • https://cdn.shopify.com/s/files/1/0437/7175/6698/files/encyclopedic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0440/1673/0277/files/bunshinsaba_3_sub_indo.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_off00005b64.bin
58837ee6f718ec4361e4de9371d24d71ca6a5fff3c75ae3aacc49470ae6ad874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B64 5244 bytes
font_01_sfnt_off00006d2f.bin
1e82200f676eabaaa7cf3abbb8e1e6e3a913237ab91bbea7e98f9293d03df181		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2F 10220 bytes

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