Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a082515867adbf…

MALICIOUS

PDF

72.3 KB Created: 2020-07-30 20:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9509a719a31a53035f8f9866d40d1f SHA-1: ece4021cce0f7acbc7cabfb81c99c6f20a0707e5 SHA-256: f4a082515867adbf9231e25c029ebfbc94457d6b5b36772fa27983f95389a65c
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though heavily obfuscated, suggests a lure related to 'Ant man comic pdf español'. The primary malicious IOC is the redirector URL, which is likely the first step in a chain leading to malware delivery or a phishing site.

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=ant+man+comic+pdf+espa%25C3%25B1ol
    • http://files.helensayer.com/uploads/1/3/2/8/132815181/497331f.pdf
    • http://files.kinneylmft.com/uploads/1/3/1/8/131856195/316938.pdf
    • http://files.shineworksdetailing.com/uploads/1/3/1/8/131856247/woromada-xazobujijimo-silomef-nerevuwaripude.pdf
    • http://files.designyoursignregina.com/uploads/1/3/0/9/130969505/2d05cedbf30b4bf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9415/5170/files/litix.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/17108041427.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/volavededelivejoguripax.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/12515621608.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/wopusijokubotugilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/12855463662.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/24707814173.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/98559598799.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6750/files/jezisu.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_off0000c3e6.bin
31fdad087f8b2033d0ccb248d74c70c0be904495bca650f1b7767008a08e4373
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E6 5192 bytes
font_01_sfnt_off0000d52a.bin
d220a7ab053f6b5e1c7f0bcb75dddabde6d54165adbb6dd1ec6c0e22dec63f6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 11748 bytes
font_02_sfnt_off0000fc74.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 16204 bytes