Malicious PDF — malware analysis report

Static analysis result for SHA-256 06340d97aba5704e…

MALICIOUS

PDF

48.9 KB Created: 2020-08-14 01:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f017eba8f3416ad9efdd33e9330ca0f SHA-1: b1c6ffd2376ab44a3cd67872d1fe7c805237551b SHA-256: 06340d97aba5704e97b020e0fa27d31234119275bc13fdf9960aaf5e3026db80
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links and text that mimic a legitimate document, specifically "Course Hero reading plus answers level g". The primary malicious indicator is a link to a known redirector infrastructure, ttraff.cc, which is likely used to obscure the final malicious destination. The document also contains a large number of links to other PDFs hosted on Shopify, potentially for SEO manipulation or to appear more legitimate. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a phishing or redirection attempt.

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.cc/pify?keyword=course+hero+reading+plus+answers+level+g
    • http://files.science1helpsite.com/uploads/1/3/2/3/132303270/2236031.pdf
    • http://files.scottkosel.com/uploads/1/3/1/1/131164425/koguzew_zetetafiri.pdf
    • http://files.papermagicbook.com/uploads/1/3/1/8/131860787/nelakojopotazedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5239/files/44449140288.pdf
    • https://cdn.shopify.com/s/files/1/0437/1854/1480/files/70174899680.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5563/files/75031574797.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9295/files/hanuman_chalisa_lyrics_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8503/files/acres_of_diamonds_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4607/6565/files/4599085710.pdf
    • https://cdn.shopify.com/s/files/1/0430/0007/0307/files/bournemouth_and_poole_college_sixth_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/dudilapixalejavil.pdf
    • https://cdn.shopify.com/s/files/1/0436/3599/8880/files/30861011011.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/72785657978.pdf
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/anime_girl_looking_back.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/32942732631.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006760.bin
0f57e8cfb2a7c6a9bb754a078704ef1c7c1ef6f23d85ab761aab13388d281f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6760 5276 bytes
font_01_sfnt_off00007965.bin
a559f4030338d4e7a21635ec421d35ff6c3c48a8dc951b32188a26bbfb6906d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 15136 bytes
font_02_sfnt_off0000a943.bin
adef7acd572d1f4a5440fe6f829d9af1e58dbb2a221572fd271d9bcc0ab11c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA943 3300 bytes

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