Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b36885f43d2782…

MALICIOUS

PDF

71.4 KB Created: 2020-08-05 03:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d72e385c5e45602e6d8451a377b080 SHA-1: 7fccbc0164ae2b2a3371d2698ef5eb4bae1bc8c4 SHA-256: a8b36885f43d2782018560def6b33302cfb51df0693c40b4d230b4ec6238b9b9
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cambridge+igcse+geography+workbook+answers+pdf, which is designed to lure users into clicking on links disguised as educational resources. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm designed for malicious redirection.

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=cambridge+igcse+geography+workbook+answers+pdf
    • http://files.madronahouseapothecary.com/uploads/1/3/0/7/130739076/lixulabufipafus.pdf
    • http://files.aufuturclothing.com/uploads/1/3/1/6/131636834/togomekisebaj.pdf
    • http://files.cageymoon.com/uploads/1/3/1/3/131380177/160989.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/84036088335.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/zorituzexanulofi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/50946726624.pdf
    • https://cdn.shopify.com/s/files/1/0437/3181/2504/files/manevefubazataxupiwixuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/sazenobino.pdf
    • https://cdn.shopify.com/s/files/1/0429/3754/8959/files/wufajedanisikixifase.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/types_of_smart_antenna.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/gebijuviboxameninavego.pdf
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/gasilazoverobobagimubox.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/west_side_story_maria_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/13989026909.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/bekerizorijij.pdf
    • https://cdn.shopify.com/s/files/1/0429/6835/0873/files/23946984375.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62b.bin
6a12ea1eba6c87941115e90dd1bbbbea5bd50d4c8f4a2ef9c723b371812d0a0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 5840 bytes
font_01_sfnt_off0000e9f6.bin
f9c8acd24a7b0b8eccc43ec1b7bc3451742b230e27c810f6b05b37b94e12a202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 11472 bytes

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