Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b74da91dae1068c…

MALICIOUS

PDF

43.0 KB Created: 2020-08-17 16:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbb37efe17e4df30366be1a400c9d51f SHA-1: 51b4ceed13c15003fdf571437aa289817047aa34 SHA-256: 5b74da91dae1068cf263a2b12893993ac88f675c610deb441ded9dbc8c4e3be5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious due to a large number of embedded links, suggesting a link farm or SEO spam campaign. One of the embedded URLs, https://ttraff.cc/pify?keyword=bol+beti+laxmi+garhwali+song, is identified as a malicious redirector. The document body contains garbled text along with the suspicious URL and numerous other PDF links, reinforcing the link farm hypothesis.

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=bol+beti+laxmi+garhwali+song
    • http://files.english.dollessence.com/uploads/1/3/0/9/130968926/vejatux_mokuxokefuv_tinegaxis.pdf
    • http://files.thegatlinfamily.com/uploads/1/3/1/4/131437873/9a391ba36ba0.pdf
    • http://files.designhur.com/uploads/1/3/1/0/131070912/repodirimepo.pdf
    • http://files.patrickbucksot.com/uploads/1/3/0/7/130740563/0e77676e0c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/jiremoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3522/files/66322539837.pdf
    • https://cdn.shopify.com/s/files/1/0434/2041/8198/files/80196082150.pdf
    • https://cdn.shopify.com/s/files/1/0434/2507/1256/files/waxikasoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2782/3765/files/34794760581.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/49390473683.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojedeteremedadedarovir.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/70570808814.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/bodutigozoxipakuvi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/vekurejerogewen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d30.bin
c62e51b8ba6434d864c662f248275a1e5d3689c5a2238cf4b3f1d6df66acd119		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D30 5236 bytes
font_01_sfnt_off00005ee2.bin
7228789fa74d01ebe31b3311443fdd960fdbab1d7acc02fea7b53d751301c3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE2 9864 bytes
font_02_sfnt_off000080bc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BC 4324 bytes
font_03_sfnt_off00008ebe.bin
dc1057295082b8f32260c14908ed8db09ce98603b3532759c795b8e58339ae11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBE 4064 bytes

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