Malicious PDF — malware analysis report

Static analysis result for SHA-256 050b577e9d5782c0…

MALICIOUS

PDF

45.1 KB Created: 2020-08-05 08:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8a41e48fc6dbc4faa3c05332d436368 SHA-1: ce2054a97c0db61e9e0ee8190a1466ef60261f7b SHA-256: 050b577e9d5782c06d9faffcff8a4473a77e7fe8bc8a68bca14eb2771577dbad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'rewrite the stars piano pdf' and a URL that appears to be part of a link farm designed to attract search engine traffic. This suggests a phishing or scam attempt to redirect users to malicious content.

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=rewrite+the+stars+piano+pdf
    • http://files.binge-writing.com/uploads/1/3/0/7/130738803/da222.pdf
    • http://files.rhfd53.com/uploads/1/3/0/7/130775734/3650657.pdf
    • http://jakamile.elisabethowens.com/uploads/1/3/0/7/130738993/2a9b69ca.pdf
    • http://files.idahotaxidermistsassociation.org/uploads/1/3/1/3/131380848/6286745.pdf
    • http://befesevit.justacupowensound.com/uploads/1/3/1/6/131607095/milafamobowadejeru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/pumetiralozewojifetepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/26172121738.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/toefl_sample_test_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/88249136029.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/tefikojumexukijisafulo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/sixemefekogulizamexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1577/4108/files/suvugoxelo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/54545013149.pdf
    • https://cdn.shopify.com/s/files/1/0432/0110/1985/files/besuxunipipajirob.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/kaxojevuvadabaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/79148292617.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c79.bin
1ac7de6f5a9ffff5b66d95b100e5412add25b0627326ee778b73989f1d24f942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C79 5196 bytes
font_01_sfnt_off00007e38.bin
4da8a208c511d304828185a2b5ea735042e9f08cc1a9b4ba391323acf3a6afbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E38 12860 bytes

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