Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3254bbc4da3a3d…

MALICIOUS

PDF

40.9 KB Created: 2020-08-05 06:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f63cd9bc3480b6c202bd541f076884d7 SHA-1: e00ff215c77eb8eda8403b4b3938b39e26b4800c SHA-256: 1e3254bbc4da3a3d84051ef164822cf5ce0bcf88ee77ee6d75cdf08d28b4c8c0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a large number of embedded links, with one specifically identified as a known malicious redirector. This suggests the document's primary purpose is to direct users to potentially harmful external content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making further analysis of intent difficult.

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=achyutam+keshavam+lyrics+in+english+pdf
    • http://files.greensoundhightech.co.uk/uploads/1/3/1/4/131453823/bbc7a9cc0608e10.pdf
    • http://files.bayjedesigns.com/uploads/1/3/1/6/131606631/4564185.pdf
    • http://jokixo.armytrailrunner.com/uploads/1/3/2/8/132814930/1708293.pdf
    • https://cdn.shopify.com/s/files/1/0447/5689/3847/files/cuisinart_coffee_maker_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4150/files/29049770165.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/jutages.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9487/files/namopopubufudoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7434/files/81933277912.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/99111496441.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/21_jump_street_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/tuesday_with_morrie_quotes.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/25204179776.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/sojudetaxejabibajawev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e97.bin
96f023a4db42845697bfaf70bb8e4136e6dc08dde2cfe32eeb48767a41666a57
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E97 5784 bytes
font_01_sfnt_off0000622e.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x622E 3720 bytes
font_02_sfnt_off00006d91.bin
92c7c970624354330358dcee5aa5afb9dc26371417707eaa41290b5e9e12803a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D91 12920 bytes