Malicious PDF — malware analysis report

Static analysis result for SHA-256 61398de582da24e9…

MALICIOUS

PDF

108.8 KB Created: 2020-08-23 21:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb44d7f473ae7c1e427803f377f8bff4 SHA-1: 6c9fbf8a1a6896e6da9594ea36a71328eaf35e49 SHA-256: 61398de582da24e95eadaa50ac20ef5fcbfcdc5e85d79e643247124ead2cb2d8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=cardiovascular+system+diseases+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or scam 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.ru/pify?keyword=cardiovascular+system+diseases+pdf
    • http://files.eugeneysantos.com/uploads/1/3/1/6/131606343/jatese_kuxoxizurivow_bunopoko_sevabazozevabi.pdf
    • http://towikukid.doctasoftware.com/uploads/1/3/2/8/132814930/fb3b46e2577f.pdf
    • http://gumelo.isth2019.org/uploads/1/3/1/0/131070678/zajeragekegava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/98865180316.pdf
    • https://cdn.shopify.com/s/files/1/0435/8301/3023/files/aeroplane_whatsapp_status_video.pdf
    • https://cdn.shopify.com/s/files/1/0430/2916/8282/files/42987516543.pdf
    • https://cdn.shopify.com/s/files/1/0429/2447/4531/files/the_evil_within_2_trophy_guide_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/bronchial_asthma_guidelines_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/94586190743.pdf
    • https://cdn.shopify.com/s/files/1/0433/4577/2698/files/89973834909.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/davunaxejapezuxipuwuwozom.pdf
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/lirinuvidozudija.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/gajesomifuvag.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/porepefufudej.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_off00016084.bin
b235993a744b32546b3283145baa924da2276f3fed883c9309aa697649ac8c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16084 5260 bytes
font_01_sfnt_off00017281.bin
5a5e8eceefb396f02a548a9720a4ed46b4a00ae8a3de8a740e1efdb68d0ee642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17281 10768 bytes
font_02_sfnt_off00019761.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19761 4324 bytes

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