Malicious PDF — malware analysis report

Static analysis result for SHA-256 67edca2bc2b08add…

MALICIOUS

PDF

48.3 KB Created: 2020-09-06 00:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ccfe39b00bfc675a3c964aa68c18b0 SHA-1: f25851f18ac359cb3b1746e2da648bd0b6c9b9fe SHA-256: 67edca2bc2b08adda13a1ba6e2e58c0e0fc1722cd971d573f3de943d3e0d1654
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users. One prominent link, disguised as an 'appcleaner for android review', leads to a malicious redirector. The ML classifier strongly indicates malicious intent, and the overall structure suggests a phishing or scam attempt.

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.club/wix?keyword=appcleaner+for+android+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/14587104016.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/warner_bros_pernalonga_dublado_filme.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/11148035114.pdf
    • https://cdn.shopify.com/s/files/1/0461/1617/6036/files/expense_invoice_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/48786474931.pdf
    • https://static.usrfiles.com/ugd/e948c1_d18a374335084aa89352074cffc41583.pdf
    • https://static.usrfiles.com/ugd/f46427_8ae2b8166b154e30a67215ec4aeca31a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c11272175974cbb830bac88bda7f0e5.pdf
    • https://static.usrfiles.com/ugd/4b7290_f06e91ecafe044039ca879051c387be8.pdf
    • https://static.usrfiles.com/ugd/756799_de9e6f6c99734468a877c2c226247bfe.pdf
    • https://static.usrfiles.com/ugd/a374b9_f8e25f56495c46cc856433b7575613bf.pdf
    • https://static.usrfiles.com/ugd/aaaf79_d5f75d9004ed473e9d0b7dbc3a028543.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/98264597452.pdf
    • https://cdn.shopify.com/s/files/1/0443/1734/3900/files/overlord_light_novel_volume_10.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/sanalugireburerod.pdf
    • https://cdn.shopify.com/s/files/1/0430/3542/6970/files/ravoxuxikixaponajexuvok.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_off00007e95.bin
a00086ae70bbc576fe69f2160122f2d98142921f2fb5d8b0de9e80f68bb25bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E95 5112 bytes
font_01_sfnt_off00009023.bin
a91fa7c7a06b6f738cb61484e8c9c3112d395bf727afdcc9b7efce7f4f276f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9023 10524 bytes

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