Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4cf234b7d65b39…

MALICIOUS

PDF

47.2 KB Created: 2020-08-12 02:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8b87c2537564578d466c354d463b989 SHA-1: b176b01ccef22fd647ca5605c1d5037dd8d7df55 SHA-256: 6c4cf234b7d65b398f17aeb9e086b17f6ecf1bf5b9435a1714213653d65a1b97
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector at ttraff.com, disguised as a search result for drawing exercises. This suggests a phishing or SEO poisoning attack aimed at driving traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=orthographic+drawing+exercises+pdf
    • http://muxamigak.vickysahlin.com/uploads/1/3/1/3/131380005/tiwogipekirojukuragi.pdf
    • http://files.c3la.org/uploads/1/3/1/3/131398333/mevopesog-jovozujezamexal.pdf
    • http://files.emmashugs.com/uploads/1/3/1/3/131379832/zajaxidorilekuver.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/60033056784.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/gulixosoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/fadoludad.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/poxabuwewogifejujiwez.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8892/files/zofuwusukitadijelukovota.pdf
    • https://cdn.shopify.com/s/files/1/0429/5357/2515/files/28047495939.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/57791400610.pdf
    • https://cdn.shopify.com/s/files/1/0431/0725/4439/files/deep_and_dark_and_dangerous.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/23612723954.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/fepureri.pdf
    • https://cdn.shopify.com/s/files/1/0428/7840/2723/files/xoxebinarenexezopelade.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/converter_to_word_nitro_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/muralexeboxirijuga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078dc.bin
e1334c6de64d03397d8aabb056b8e282a91920e2f0a940a93964c4d2f4aa95af
pdf-font-stream PDF embedded font (sfnt) at offset 0x78DC 5572 bytes
font_01_sfnt_off00008be0.bin
1ad63804af3629bd6982c862cac116a0a9f49dd07fb0ff84fd4169c3522f5e0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE0 10780 bytes