Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a27163616461e7b…

MALICIOUS

PDF

47.1 KB Created: 2020-08-11 01:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285a4e25fd2d338937db284951ed1187 SHA-1: f8a2dc4c7cd8ca0f0c051f7962889d062999fab9 SHA-256: 7a27163616461e7b945192c552d1a55bec489e65119a0b8b11bb55dd20b55a77
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one that redirects through known malicious infrastructure to a URL that appears to be a lure for job seekers. The presence of multiple algorithmically generated URLs and a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=executive+assistant+to+the+president+job+description+pdf
    • http://nesos.mabellepresent.com/uploads/1/3/2/3/132302942/c70a3.pdf
    • http://xoguxu.crosskeysbarn.com/uploads/1/3/1/6/131607029/8574944.pdf
    • http://files.arcsurgery.org/uploads/1/3/1/0/131071043/dinigodijikozurefez.pdf
    • http://files.chihuahuafrentealcambioclimatico.com/uploads/1/3/0/7/130775432/vulelutus-kivuter-zevisudidubu-gubexaruwum.pdf
    • http://silafa.aerialsouthampton.com/uploads/1/3/2/8/132814930/jijaxixijonado-lofonukudir-xipuxagor-sofawa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3022/2747/files/994642581.pdf
    • https://cdn.shopify.com/s/files/1/0429/6291/1391/files/bobidafimi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/nike_football_brand_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/fundamentals_of_general_organic_and_biological_chemistry_mcmurry.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/1598489295.pdf
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/kewekalexavutuwugafet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0402/5242/files/pl_sql_tutorial_point_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/58579583401.pdf
    • https://cdn.shopify.com/s/files/1/0433/5697/9351/files/msn_gaming_zone.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2443/files/vlookup_in_excel_2020_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/8846/8376/files/58471087223.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/giwebo.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_off00007a53.bin
f1f87af69727ef41ff0aa7f5cc7bd7efd63155c9b758983b98a7b6a129eeeb29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A53 5512 bytes
font_01_sfnt_off00008d0d.bin
968cdeff2514653c97da27097134a91949478cace3681a7d9e6070ba954bbcdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D0D 9848 bytes

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