Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a59e9f2b4c1a0f3…

MALICIOUS

PDF

41.1 KB Created: 2020-08-24 01:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15ea5a191f51e6a6dd042e6af8a0cc76 SHA-1: ae7681e2d7f355af20b75d29dec3d5d58a06545c SHA-256: 1a59e9f2b4c1a0f34903547152d05329b2494646d16de2053e0444305b0fc4e7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a video song and also includes the malicious URL. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning attempt to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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=video+song+ehsas+by+naveed+akhtar
    • http://fuzeretus.marygoldsteinpt.com/uploads/1/3/1/3/131384605/mubikugunivinawiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/buffalo_wild_wings_printable_menu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3136/3747/files/saad_lamjarred_video_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/87672695593.pdf
    • https://cdn.shopify.com/s/files/1/0431/7226/6150/files/english_language_proficiency_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/gofat.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/xafuxebuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/4784/5030/files/5751180118.pdf
    • https://cdn.shopify.com/s/files/1/0449/1870/2247/files/root_words_in_english_for_cat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/virawovidigepifizebepab.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_off00004b1c.bin
dff63292d9b87c7cfb159d1c4e473c8935924fd0cf49c75de57d31473e8095c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1C 5176 bytes
font_01_sfnt_off00005cb0.bin
673c8880a68528c8481f90f55ddccf0ce8166b8005dd18c9c6919016d5e08d85
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB0 14424 bytes
font_02_sfnt_off000089a2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x89A2 4324 bytes