Malicious PDF — malware analysis report

Static analysis result for SHA-256 01502dffc17528bd…

MALICIOUS

PDF

32.3 KB Created: 2020-08-03 15:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a067b57ba40f4a0f43394f7fe63711 SHA-1: 6161758343958c4bcc726f39243844a8604d2bdc SHA-256: 01502dffc17528bdf21f57dfd611396b17b970d9f6ab6a0c04eb008add20d602
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious PDF

The PDF document contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=autumn+leaves+piano+notes+pdf
    • http://files.idajaneeyelashextensions.com/uploads/1/3/2/6/132695493/1862757.pdf
    • http://files.divinedonutsusa.com/uploads/1/3/2/6/132683330/fozexofowadel-zewenavaxuse-nereki-labedum.pdf
    • http://files.nidinidi.ca/uploads/1/3/0/7/130776641/eee6f076364.pdf
    • http://files.tehyadiamond.com/uploads/1/3/1/6/131606331/e59011.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/lorivinosolunitaxubi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/66052282848.pdf
    • https://cdn.shopify.com/s/files/1/0429/0061/9423/files/weteg.pdf
    • https://cdn.shopify.com/s/files/1/0441/4350/9656/files/barney_i_love_you_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0439/6482/5758/files/63690995620.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/melutiwer.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/24815631056.pdf
    • https://cdn.shopify.com/s/files/1/0433/5517/7109/files/58137056765.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/fefejurusol.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/firajebe.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/kidogibunowigelulan.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_off000042cf.bin
b2c60ef1302b55ebc57580a8b0b7ed482d238c56377911de50675ce56c63b94c
pdf-font-stream PDF embedded font (sfnt) at offset 0x42CF 5140 bytes
font_01_sfnt_off00005446.bin
8408f7edf772b1d7aecd8e7cd3a04dcbcb9be2b525c656655689d7fc77c8076b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5446 9492 bytes