Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c2187a4526f936…

MALICIOUS

PDF

41.5 KB Created: 2020-08-10 15:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37eeb1c8cb77f2422485d71dbe972af5 SHA-1: 655896bc475ef757ec695e8112cf4bd16544c486 SHA-256: f5c2187a4526f93623265a986cb5999bf2a92a914eb1a9d1030b6f604f7d166d
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure via embedded links.

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=daily+newspaper+pdf
    • http://files.preecelightning.com/uploads/1/3/1/3/131397987/jimega.pdf
    • http://files.allmetalcornerguards.com/uploads/1/3/1/4/131437977/5540224.pdf
    • http://files.empachernorthamerica.com/uploads/1/3/1/4/131406434/32790b2f0b440.pdf
    • http://files.ncelementary.com/uploads/1/3/1/4/131407112/9457ea8f5af.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/galazivogunuro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/49756529019.pdf
    • https://cdn.shopify.com/s/files/1/0432/2364/6365/files/variance_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/52357518902.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/42568308601.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/60963737428.pdf
    • https://cdn.shopify.com/s/files/1/0451/2520/6169/files/22854606091.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/guidelines_for_bioavailability_and_bioequivalence_studies.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/pdf_to_word_docx_converter_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7688/6431/files/dugoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/62189304596.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/everything_about_periodic_table.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3501/files/tifuvejoxowexutopam.pdf
    • https://cdn.shopify.com/s/files/1/0437/9308/8661/files/church_usher_manual.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_off00006525.bin
8796c73dad4eb6d52150581f0544e0ab6cf87a70b269922d5a64e577555cb933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6525 5228 bytes
font_01_sfnt_off00007717.bin
74faa4cd75dddd1456852010b3c575882fd1a59a7e3504539cbd4779f9f5d12e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7717 10032 bytes

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