Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d6abce3a211046…

MALICIOUS

PDF

38.0 KB Created: 2020-08-25 10:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c63b14f43e3ee7cd6ee02aa7d962cfbb SHA-1: 1320cba9564554b9efdb3edfceefe968f35108f4 SHA-256: 43d6abce3a2110460e9d6cf3aca8553316d0e9e540dad798af303ad99deebd8a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised with a search query for 'Auto indent shortcut android studio'. This suggests a phishing or scam attempt to direct users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the payload.

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=auto+indent+shortcut+android+studio
    • http://gufojeke.americanbeautyesthetics.com/uploads/1/3/2/7/132712415/xepevibidaja.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/celebrating_diversity_through_world_literature_teacher_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6367/files/estilo_de_aprendizaje_auditivo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/22512648432.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/porsche_cdr_30_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/71839120859.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/welixidotapojox.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/51540413611.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/bestiario_de_arton_vol_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/58361205754.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_off000057cb.bin
1c925a7303bdd65393d80315dfd697c058935231dae7b5403a95107181520491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CB 4984 bytes
font_01_sfnt_off000068af.bin
f7b719204e980032def815a02079e1fc56bc4066e130bb89849bfba8d9f2ecad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AF 10212 bytes

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