Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcbd60933e83765…

MALICIOUS

PDF

37.2 KB Created: 2020-08-10 19:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd76f57bae58561859cd8a27103d5db2 SHA-1: 37168241de3f234ce98f65bdd8c024c25b874f2d SHA-256: 5bcbd60933e83765012e997e0ba46f09defa99165fd98346e7af52ace92cbaad
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector infrastructure, which is a common tactic for distributing malware or phishing pages. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or SEO manipulation for malicious purposes. The document body itself contains a URL that points to a redirector, further supporting the malicious intent.

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=boca+do+inferno+ricardo+araujo+pereira+pdf+download
    • http://files.chelseagsps.com/uploads/1/3/0/7/130776499/kejatomawusix_zeximedabukeku.pdf
    • http://dosamube.dori-shasha-art.com/uploads/1/3/0/7/130739561/jogegodimo-vizifogexititod-zekafubelivefe.pdf
    • http://files.dmruizcreative.com/uploads/1/3/0/8/130814056/335a57c.pdf
    • http://files.alexasnyderstudio.com/uploads/1/3/1/4/131406600/vidumuwipiturijalil.pdf
    • http://files.ommademeetthemaker.com.au/uploads/1/3/0/8/130813781/afd355f129e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7697/4747/files/99870785708.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/75314681204.pdf
    • https://cdn.shopify.com/s/files/1/0439/4038/0840/files/37907055306.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rabilividobakomitunaxizug.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/lodawakepopofokimujovivod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3042/files/avril_14th_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/13565555383.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2392/files/48978253370.pdf
    • https://cdn.shopify.com/s/files/1/0438/6340/8795/files/metigakojap.pdf
    • https://cdn.shopify.com/s/files/1/0440/5470/8389/files/10th_math_formula_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/4303/2983/files/generalized_epilepsy_with_febrile_seizures_plus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/elementary_algebra_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/wegagizi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/zomulumixizurilujazomoxu.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_off000052b2.bin
6e97e70709e0f6bf0c3cfaad94bd4543e8da5fe31e2b37a4cca6045e53d197ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B2 5188 bytes
font_01_sfnt_off00006474.bin
4d986aaca13d4b5e05345c04843adf64110c36b35346db047197db041af74e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6474 10228 bytes

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