Malicious PDF — malware analysis report

Static analysis result for SHA-256 efec928adae5c0f7…

MALICIOUS

PDF

33.4 KB Created: 2020-08-08 17:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e4a51672e2146fc800a624d34acc16 SHA-1: 35dbac6a82e1855d32c8fc97c33f0057ed9fd341 SHA-256: efec928adae5c0f7b850da55f3152a3189350651d348ed69aa0e470dc44b6947
154 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, identified as a link farm, pointing to various external resources. One of these links, https://ttraff.ru/pify?keyword=tiempo+de+canallas+carlos+alberto+montaner+pdf, is flagged as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or to download further malware. 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.ru/pify?keyword=tiempo+de+canallas+carlos+alberto+montaner+pdf
    • http://files.dogwooddoodlebugs.com/uploads/1/3/1/3/131381464/tokugevopepod-dexubikirawiw-pinas.pdf
    • http://files.piac.org.au/uploads/1/3/2/8/132814949/c5a0b1066.pdf
    • http://files.roboticsforall.net/uploads/1/3/0/7/130775001/teruduxevilizif.pdf
    • https://cdn.shopify.com/s/files/1/0439/7917/8142/files/avian_respiratory_system.pdf
    • https://cdn.shopify.com/s/files/1/0441/0851/3432/files/84204872460.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/pujelixememuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/wobuligonugilobeveluroxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0386/files/pixonawenorigofekaxosuduj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/bazazod.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8493/files/javibusubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/73407325302.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34888362351.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_off000042d9.bin
ccb8bb56e1489df2bca4469f49fbaf5847934930b2e2c23baf40d7ab47796d62
pdf-font-stream PDF embedded font (sfnt) at offset 0x42D9 5392 bytes
font_01_sfnt_off0000550c.bin
77a7554f29f596bd68337dbb2dc9cfa3b913479c233b673c8e5098d057938748
pdf-font-stream PDF embedded font (sfnt) at offset 0x550C 10528 bytes