Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeacbbd67e7df1f2…

MALICIOUS

PDF

50.8 KB Created: 2020-08-11 09:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18bc2ef24ef6140d217ce44712e4d8d0 SHA-1: 70b1fc888bd2bf89ef8af8fd87fdcf567e0bc5a0 SHA-256: aeacbbd67e7df1f24f9b7b3b298a71883beb0ae7427cfd2728ba1df9d1bf950b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is further reinforced by the ML classifier's high confidence score. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking URLs, likely intended to appear legitimate. The primary malicious URL is `https://ttraff.com/pify?keyword=pdf+books+free+download+in+sinhala`.

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=pdf+books+free+download+in+sinhala
    • http://files.wildflowerphotograph.com.au/uploads/1/3/0/7/130738914/5d57e43dfe20.pdf
    • http://files.christhamilton.org/uploads/1/3/2/7/132710627/699823.pdf
    • http://pirivodu.whitecoatantidote.org/uploads/1/3/0/8/130814328/zawiwafiromafakafili.pdf
    • http://files.alysebensel.com/uploads/1/3/0/7/130739112/niwizafegidome.pdf
    • http://sezawiwe.beckfordmedicalcenter.com/uploads/1/3/0/7/130775732/xoragore_boponusidabotu_diwovomif.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6885/files/contoh_skripsi_akuntansi_perpajakan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutowoterefabobenovise.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47171602999.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8720/files/rainmeter_temperature_skin.pdf
    • https://cdn.shopify.com/s/files/1/0437/9954/3970/files/gebisetosevisukibebefowo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/wii_u_rom.pdf
    • https://cdn.shopify.com/s/files/1/0431/9844/7778/files/download_teks_asmaul_husna.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/luwelenage.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/27447191767.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/bibimonelufurujif.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2504/files/21770312771.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/mofotovu.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_off00005937.bin
c098b8c997d8ce976489f979227e3bbfab4143125e29cc04edbe34677ec84741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5937 5292 bytes
font_01_sfnt_off00006b04.bin
e41f235bb9d54ae7fc4d39153ee429a9db12c4e861ffb4c54d506ae3ce3a8e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B04 18176 bytes
font_02_sfnt_off00009848.bin
95735afa6898ffa833c487eb1c0d26ce1768fde90411fa5e8137ed71e467ecc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9848 10756 bytes

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