Malicious PDF — malware analysis report

Static analysis result for SHA-256 38df8b688ef26c14…

MALICIOUS

PDF

43.6 KB Created: 2020-08-08 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb0db004b6063d5db51455806e2cbf9 SHA-1: 2d0609bf7765d011c564d7d834b781969f2deaed SHA-256: 38df8b688ef26c145da044683ab3d5bb27a07be22f33cf9ee0afa0c21f522d52
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates a link to a known malicious redirector, ttraff.com, which is likely used to distribute further malicious content or phishing pages. Another critical heuristic identifies a large number of external PDF links, suggesting a link farm or distribution mechanism. The document body contains the URL that triggers the malicious redirector, indicating a direct attempt to lure the user to a malicious site.

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=non+probability+sampling+examples+pdf
    • http://files.angelinternationalmanagement.com/uploads/1/3/1/4/131453636/39541ee40c7e.pdf
    • http://files.electro-haptics.com/uploads/1/3/2/8/132814969/2708551.pdf
    • http://files.nancypenchev.com/uploads/1/3/1/3/131381706/f1e606cc795e70.pdf
    • http://files.sevenstarsamerica.org/uploads/1/3/1/8/131871816/bukezo_rinifigimetabi_tuvovetosiv_kutimufufeluk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6777/6919/files/ripulirevifovipinog.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/engineering_mechanics_dynamics_meriam_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0450/3424/2198/files/biology_11th.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/gevevov.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/xotofujaretorir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/mulozeloxafotekuwuvoxaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demajez.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9558/files/88486348689.pdf
    • https://cdn.shopify.com/s/files/1/0439/5198/0712/files/vmware_fusion_11_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/5954/3192/files/82537741276.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/bupixinepotig.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8501/files/3129642145.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000611b.bin
8547dc1f7f7600b2ef9e9c3870585fb4c08332a0c480902d5f2e542e1938353d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611B 5428 bytes
font_01_sfnt_off0000737a.bin
709112e573004a302293141ea38484c38d092445d3154f6eef4df9346b2dd8ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737A 9240 bytes
font_02_sfnt_off00009300.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9300 4324 bytes

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