Malicious PDF — malware analysis report

Static analysis result for SHA-256 562ce5b466311680…

MALICIOUS

PDF

53.7 KB Created: 2020-08-06 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19618e4b268232958a52f60cb345ec18 SHA-1: e957d387be9e95dc2e61a39c328ac7899db1ece2 SHA-256: 562ce5b4663116806ea18b87e59dc5c9dfcc30dea1a5324325ccd97efff025f4
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=modified+borg+rpe+scale+pdf. Another critical heuristic identified a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious content.

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.ru/pify?keyword=modified+borg+rpe+scale+pdf
    • http://files.divinecreativesynergy.com/uploads/1/3/2/8/132814400/fawatojet.pdf
    • http://files.justinecorrie.com/uploads/1/3/1/4/131407144/kepib_munexi_pibelo.pdf
    • http://files.ambientisolation.com/uploads/1/3/1/8/131860204/vubofozezuti-lizalelidolude-vusajatekelolom.pdf
    • http://files.margateterrapinrescue.org/uploads/1/3/0/7/130775277/panewuxeko.pdf
    • http://files.bostondigitalproductions.com/uploads/1/3/0/7/130739789/kufuxorimi_tanubabovolus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/11191993951.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/9430346302.pdf
    • https://cdn.shopify.com/s/files/1/0434/7805/7122/files/zogeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8385/files/rovaduzepetinekuvok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/xafujogas.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/vigabotipafulu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4540/2277/files/apostila_calculos_trabalhistas_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/0822/8508/files/78399984566.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/craftsman_radial_arm_saw_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0517/3147/files/50327253149.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_off00008660.bin
b255861c22728e5acf2ebbab57880a3238e49bec51a3232f1d1e98ef3ab458d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8660 5072 bytes
font_01_sfnt_off000097ae.bin
1caff5daa7d7e1b0d77cc104143cba913a23ac92cd24aabd78562050e4491ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AE 10564 bytes
font_02_sfnt_off0000bb8d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8D 4324 bytes

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