Malicious PDF — malware analysis report

Static analysis result for SHA-256 23727c8b048ec02e…

MALICIOUS

PDF

61.8 KB Created: 2020-09-08 14:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f19a5cbf7991dc2781e6f623a8f3f6a1 SHA-1: 2b77f616bd590ca22737f190eb75b7d670c719c4 SHA-256: 23727c8b048ec02eb57a29b37d6647b1a517cb5ddea9a7214bfcba6d87e27707
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links to external PDF files hosted on Shopify, suggesting an attempt at SEO manipulation or link farming. One of these links, 'https://ttraff.me/wix?keyword=chrysler+crossfire+srt6+performance', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL, reinforcing the malicious intent.

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.me/wix?keyword=chrysler+crossfire+srt6+performance
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/anastasia_broadway_musical_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/86167494540.pdf
    • https://cdn.shopify.com/s/files/1/0441/0369/6536/files/present_tense_past_tense_past_participle_words_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/65169000784.pdf
    • https://cdn.shopify.com/s/files/1/0431/9723/5363/files/91129913510.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/68056446164.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/jisojidunitajagireli.pdf
    • https://cdn.shopify.com/s/files/1/0433/6340/1877/files/kadubokamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2131/9839/files/target_twin_sheets_sets.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/41955831497.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/10674074485.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/61565491550.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/
    • https://cdn.shopify.com/s/files/1/0432

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009359.bin
0194745e1febbbd4bbdbd146454a4b2ba35ac52bdcce5a1b389e005b0b31a8ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x9359 5416 bytes
font_01_sfnt_off0000a59c.bin
ce4da55aaaa82c8448c4562b0928ee304d61893d8654d71965a66b6e6215af12
pdf-font-stream PDF embedded font (sfnt) at offset 0xA59C 15280 bytes
font_02_sfnt_off0000d51e.bin
b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 16060 bytes