Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ef3526ec435d28…

MALICIOUS

PDF

46.2 KB Created: 2020-08-03 13:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3076e6260bc291d66f5d6cb70831a2 SHA-1: 339e77993b8489b3763e337b78dd9e629c994c81 SHA-256: 35ef3526ec435d285aeb107a077c1246a9448881c2c0df709c4fcd2405fc3d34
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to what appears to be a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which further points to a malicious URL. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same URL found in the redirector heuristic, suggesting it's the primary lure.

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=advantages+of+vlsi+technology+pdf
    • http://files.zaktrojano.com/uploads/1/3/1/4/131437977/xawijuvil_xefivagata_resemugelaziv.pdf
    • http://files.azlife.church/uploads/1/3/1/8/131871864/rejogonozupivinome.pdf
    • http://files.alexandraforsythermt.com/uploads/1/3/1/3/131379591/5198369.pdf
    • http://files.aiacsrep.com/uploads/1/3/0/7/130776439/wuwazafiwu_nigaxosa.pdf
    • http://files.thenecessarian.com/uploads/1/3/2/6/132681219/pereloxuvapuja_wiruraxeba_mexipufovamawi_foxezibaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/wikonanemufezapamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/speed_form_deoxys.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4387/files/musugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4429/8133/files/8249059809.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wevola.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/zirunoxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9157/4430/files/9688712951.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3186/files/merififimorapuzolutoje.pdf
    • https://cdn.shopify.com/s/files/1/0440/6771/7270/files/python_find_duplicates_in_list.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/32259374849.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5262/files/50347524022.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/31796320021.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_off000075bc.bin
239def2761c1a3c0a3283129311fe2ef58034ad4c32d90e2e4ff6f9bfea94eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BC 5472 bytes
font_01_sfnt_off00008871.bin
c0f21603e01721621840c390ef6e8b7aea78f4e8f054f87857493c12ae381385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8871 10176 bytes

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