Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b117dc5a876c17…

MALICIOUS

PDF

47.2 KB Created: 2020-07-29 21:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08235be43dfd053f92f262f6ab457f5c SHA-1: a5203a83cdf885941fca3a38f90d85a54de7b6a1 SHA-256: b6b117dc5a876c17a135218ecfb5da93aef91594c5a8fa9c5629e18c2a517d35
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `ttraff.com`. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`. The primary attack pattern involves a link farm designed to redirect users to 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=contemporary+issues+in+financial+management+pdf
    • http://files.athensdeltasigmatheta.com/uploads/1/3/2/8/132814958/lenokuruxukosima.pdf
    • http://files.avistonlegion.com/uploads/1/3/1/8/131856212/784f9ab5.pdf
    • http://files.travelingnurses1.com/uploads/1/3/1/6/131606605/9509599.pdf
    • http://files.missionnazarenepreschool.org/uploads/1/3/2/7/132740541/berejuwojowugarat.pdf
    • http://files.sidleystandup.com/uploads/1/3/0/7/130775942/3089407.pdf
    • http://files.missionnazarenepresch
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/pumekaridinojuzeropipunar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9223/0823/files/58746536116.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13652925252.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/18384896493.pdf
    • https://cdn.shopify.com/s/files/1/0428/4393/0791/files/mekiwemedowusesuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/3612622162.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/19307400894.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/29513396080.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tikifulodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/pazoxuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/vokufaposuwukemorinitu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/butag.pdf
    • https://cdn.shopify.com/s/files/1/0438/0380/3808/files/3268977899.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/46189911471.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_off000078b4.bin
caf9b1c63295f73217687542e3c0c9f3da5cf2e43fb873d6aacd4e6610ce5c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B4 5484 bytes
font_01_sfnt_off00008b43.bin
df83dbd3eb99c743f7e1fbb615ac13a1fec38837065c118ffb590f5ea8663a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B43 10440 bytes

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