Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ecc0263bad1d23…

MALICIOUS

PDF

38.1 KB Created: 2020-08-18 14:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05a96ff08d1f1551fc8ff6928e7503e SHA-1: ba143578f7da1f3c656dc7b31aa0a4af9aa9f46d SHA-256: 31ecc0263bad1d23ed3da2a5db4e102948b26624f407aa2fde1244c6a05b6bef
152 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.com/pify?keyword=brand+new+punjabi+video+song, which is likely used to redirect users to further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=brand+new+punjabi+video+song
    • http://puzeluruv.animallifeline.org/uploads/1/3/0/9/130969723/ruwoxisexolawofu.pdf
    • http://foxoredaj.hyveecolumbia.com/uploads/1/3/2/6/132682924/luzunuw.pdf
    • http://files.nib-ex.com/uploads/1/3/0/8/130873804/8632782.pdf
    • http://files.gaulke4assembly.com/uploads/1/3/1/3/131378776/beteresodubu_josugur_vagibadabemagok_mojileg.pdf
    • https://cdn.shopify.com/s/files/1/0435/3042/0384/files/dovapodopakovutija.pdf
    • https://cdn.shopify.com/s/files/1/0428/8518/5702/files/sedenan.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/zoledi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/57800682375.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/xavorumirigiwenajumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4955/files/penyebab_penyakit_jantung_koroner.pdf
    • https://cdn.shopify.com/s/files/1/0440/6552/1814/files/41414242776.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/library_management_system_php_template.pdf
    • https://cdn.shopify.com/s/files/1/0452/5237/8781/files/60536237670.pdf
    • https://cdn.shopify.com/s/files/1/0434/7445/2632/files/wopuzopizafedux.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/barron_s_math_workbook_for_the_new_sat.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_off000056a0.bin
f62054a8a38545242005990151b85de9121b1c6d7d92d4c8c14aa0f4504b78d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x56A0 5512 bytes
font_01_sfnt_off00006980.bin
bbc8795d2cab2398f04c7768aaf6937caa1e4350d70297af57d134763045ed67
pdf-font-stream PDF embedded font (sfnt) at offset 0x6980 10040 bytes