Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf42740f6569183…

MALICIOUS

PDF

46.6 KB Created: 2020-08-23 01:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 093e2c1b18d700b2c3fec10aff5da192 SHA-1: 77b6ede61a45286f076480e3b909b5d5bfd5d965 SHA-256: 1cf42740f65691837536465eb65d14d019d24312bff87920eeed8625213f630c
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The primary malicious URL identified is https://ttraff.com/pify?keyword=bushcraft+shelters+pdf. The document body is heavily obfuscated and contains embedded URLs, further supporting the malicious intent.

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=bushcraft+shelters+pdf
    • http://files.shorewaybusiness.co.uk/uploads/1/3/0/7/130776366/a8f37b6667.pdf
    • http://files.ryrg.net/uploads/1/3/1/4/131438176/nakumefusulesawi.pdf
    • http://jamapep.drcathieenglish.com/uploads/1/3/2/3/132302720/be06f329f2118.pdf
    • http://files.aeesei.com/uploads/1/3/1/4/131437873/9553146.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/birufigejogav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/kuzojolivuzumageliniziba.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/7528790566.pdf
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/11962774781.pdf
    • https://cdn.shopify.com/s/files/1/0435/3831/7464/files/58603352790.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/sanubol.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1121/files/97958988095.pdf
    • https://cdn.shopify.com/s/files/1/0432/6257/4750/files/87570839018.pdf
    • https://cdn.shopify.com/s/files/1/0460/0535/4657/files/apk_anonytun_achi_terbaru.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7039/files/88652596236.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4665/files/65435501424.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/29623971299.pdf
    • https://cdn.shopify.com/s/files/1/0435/6558/0437/files/boss_gt_1000_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_off000079b5.bin
439f3502c1e8af55b95549a6ad30f2f03271d30d0785182b61fcb5d50f8a5e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B5 5292 bytes
font_01_sfnt_off00008bb2.bin
b39723c894712ba40005eb8808809408686281318ee0314061df8ca55425b5cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB2 10056 bytes

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