Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4242305d72536b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-05 04:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20ffa72d0ed9cd2d270a153689cccd43 SHA-1: 0825345aabbc3cfceb6eea150188995b34dfb055 SHA-256: 3f4242305d72536b5e28aa310e4193408c703901ed0cd2a52b591097cdda8c4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to obscure the final malicious destination. The primary malicious URL identified is https://ttraff.com/pify?keyword=cambridge+primary+english+stage+5+teacher+s+resource+pdf, which likely serves as a lure or initial stage for further malicious activity.

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=cambridge+primary+english+stage+5+teacher+s+resource+pdf
    • http://files.jillrapperport.com/uploads/1/3/0/7/130776042/sexekusejuke_nadinafotoxevo_ruzise.pdf
    • http://files.pnwcollective.com/uploads/1/3/1/4/131453530/fagek.pdf
    • http://files.dustinrippetoe.com/uploads/1/3/1/6/131637224/lesovavemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/sijakilujezijizavemesami.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/ritelovufokazinoxulone.pdf
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/80510947776.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/11453837191.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/34198079581.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/wobilizulebamoluxowe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5332/files/viguki.pdf
    • https://cdn.shopify.com/s/files/1/0430/1222/7225/files/75128540587.pdf
    • https://cdn.shopify.com/s/files/1/0430/7150/4537/files/15175768502.pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/html_tags_and_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3315/files/29964136646.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_off000051cb.bin
e333ce9f64a1f4da87b77b9bdcd9464b382a20a6ce317e021d5aa5c160b44906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51CB 5840 bytes
font_01_sfnt_off00006585.bin
c608677692a72db6ee49772446e3f5cf0be9586377f04c9c710ac6ad26560978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6585 10656 bytes
font_02_sfnt_off000089c5.bin
9eca09f5f5a5ae6aeb14838e1f7d6c4e8050a90f1286ce2590318f097e28e1fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C5 16964 bytes

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