Malicious PDF — malware analysis report

Static analysis result for SHA-256 891c272c86a1de55…

MALICIOUS

PDF

66.1 KB Created: 2020-08-08 14:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83af0ee1f7b2afa3a194feb5d8bcee8c SHA-1: 86e6cad63334101eb49007e963748a3753f14134 SHA-256: 891c272c86a1de55f7de1dd74ec5f7860720d5d14ad60bab4a8e22321bf63852
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a textbook solutions manual, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to host or chain to further 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=mathematical+structures+for+computer+science+6th+edition+solutions+manual+pdf
    • http://relux.nfspto.org/uploads/1/3/0/7/130775795/fupepixotexexipop.pdf
    • http://files.renaissancefarmburlington.com/uploads/1/3/1/6/131606758/nupiwokigubeve-vazef.pdf
    • http://files.fnmiec.ca/uploads/1/3/0/9/130969710/7682567.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9740/0223/files/38245962169.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/9720610270.pdf
    • https://cdn.shopify.com/s/files/1/0431/8075/3058/files/vefapegopefupukatogunolib.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/gimp_blur_background.pdf
    • https://cdn.shopify.com/s/files/1/0438/3506/4480/files/xofenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/approaches_and_methods_in_language_teaching_by_richards.pdf
    • https://cdn.shopify.com/s/files/1/0434/7789/3270/files/xexarodatasosititavawurul.pdf
    • https://cdn.shopify.com/s/files/1/0428/8482/5247/files/gakuvawawaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69298849274.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5229/files/no_man_s_sky_walker_brain.pdf
    • https://cdn.shopify.com/s/files/1/0432/1781/3661/files/cisco_ccna_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/kipibowimevowu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/54188729335.pdf
    • https://cdn.shopify.com/s/files/1/0439/7993/1806/files/alphabet_phontique_de_l_otan.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_off0000b56a.bin
eb5e814d52c246909879796f4329fccb93f73b34bcd6c3adddf71b2484a0123b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 5552 bytes
font_01_sfnt_off0000c82d.bin
a3d4956379d70fdcf4aded6175068196b1226c686a035818d0550ea210389f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 16320 bytes

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