Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb0e02443bd2796…

MALICIOUS

PDF

34.6 KB Created: 2020-09-01 00:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed3c1554eafceba38969a53e2424142a SHA-1: 7c9ee45983f7a8235e38d7afcc932c78723c811a SHA-256: cdb0e02443bd279641f9f3302bed2d5b598bf02f3f7fdf5a28040efbb6753e76
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a large link farm suggests an attempt to lure users to potentially harmful sites, possibly for phishing or malware delivery. No scripts were extracted from this sample.

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.com/wix?keyword=tune+ukulele+app+android
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/84436346021.pdf
    • https://cdn.shopify.com/s/files/1/0432/0450/9853/files/tokorixoratevezeve.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/nazufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sezam.pdf
    • https://cdn.shopify.com/s/files/1/0452/3737/1037/files/ado_activex_data_objects.pdf
    • https://cdn.shopify.com/s/files/1/0432/3773/6603/files/83936116402.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/muxomebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/68706428654.pdf
    • https://static.usrfiles.com/ugd/7d21c0_b93b087e52984fcba99d8f2ea37774d1.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_09e61849dc8940108fe1a3dfe411a201.pdf
    • https://static.usrfiles.com/ugd/b8c837_cec04c638e034c9bb057eca5ea089791.pdf
    • https://static.usrfiles.com/ugd/516793_21617026d0f94a9f9f3632c9079689ef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/goxapawutajitozatejena.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/club_car_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5056/4773/files/43085713962.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cd9.bin
941e3a23ec84d550af8075bdded506115e2e946b67be52827662f3655417d671
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD9 4788 bytes
font_01_sfnt_off00005d2e.bin
d915e98b7ece9ac720456532c9a329c06dc57afb045c7243160a3f337e585b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2E 9444 bytes