Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7325b1a39555022…

MALICIOUS

PDF

110.1 KB Created: 2020-09-14 23:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d166ea0ca48d8d412d36a109e5d4430d SHA-1: 796c6d5531ea7dec8b9e05e5efb69a897b8b2dc7 SHA-256: a7325b1a39555022b4aafabb647e1203cacd78e61727d1201aa58101c76948e7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests a phishing or scam attempt designed to drive traffic to malicious sites.

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/wb?keyword=one%20ok%20rock%20answer%20is%20near
    • https://cdn.shopify.com/s/files/1/0443/4237/8652/files/best_converter_to_word_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9841/3987/files/mp3_volume_booster.pdf
    • https://cdn.shopify.com/s/files/1/0432/9321/2827/files/jiziluweluneno.pdf
    • https://cdn.shopify.com/s/files/1/0463/1127/6706/files/bajuwibugodut.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_0ad081b82e144a799d8ec153a6a42f0c.pdf
    • https://static.usrfiles.com/ugd/f99735_80fc379a607645be8a32a326c8a4b3d8.pdf
    • https://static.usrfiles.com/ugd/8e66a5_23ed3c1f1a95409a96f6b0bc4ef23881.pdf
    • https://static.usrfiles.com/ugd/58a813_9847fa915ebe43b2b2be41b256090882.pdf
    • https://static.usrfiles.com/ugd/cb4a18_eae6489d988442f1ba7870b8c7652a40.pdf
    • https://static.usrfiles.com/ugd/efb3f0_44a8b535a34b41b4a3b4834513df1497.pdf
    • https://static.usrfiles.com/ugd/dcc11b_649289c21a544cdbb3c7062406b7a8e8.pdf
    • https://static.usrfiles.com/ugd/dcbeda_a14ab15090c848b782c4d4464f1f9678.pdf
    • https://static.usrfiles.com/ugd/41f880_12511fe772e04a6b95bb44de74ec8c6f.pdf
    • https://static.usrfiles.com/ugd/a0905b_8c3a86d056aa45d8810471b2901e1f2e.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4812/files/bogoxazinibineziwud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/78083210651.pdf
    • https://cdn.shopify.com/s/files/1/0437/3299/2161/files/12524615088.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_off000074d2.bin
7a6acd8359c0ac20e979114172238dca411f734eb559f68de6172070c9fee192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D2 85812 bytes
font_01_sfnt_off000175a3.bin
0c782787f7170a4e50ae8c6f8da19b9c2842a433a51ce8c09ffbd0bc6adee6af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175A3 4944 bytes
font_02_sfnt_off00018694.bin
bbc6187f1f75eaa203598a07566ec414e57f683bd9bdad280eb2fd0d19782942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18694 9844 bytes

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