Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff867a54b4f2fe8d…

MALICIOUS

PDF

57.2 KB Created: 2020-08-01 12:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f7ef077e4f3ff1557100e40a1d53ec SHA-1: 3f3832cc42bf8ae94c499c502a95375977676832 SHA-256: ff867a54b4f2fe8d715cf85c01cf1784b617e91c2352e47aefa5eaa05b961b22
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for 'Sigmund Freud books pdf'. The PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, suggesting a broad distribution attempt. 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.ru/pify?keyword=sigmund+freud+books+pdf
    • http://files.mollypelletieryoga.com/uploads/1/3/1/1/131164573/nutojoka.pdf
    • http://files.westcoastharps.com/uploads/1/3/1/4/131406498/mevoxis.pdf
    • http://files.rhpsip.org/uploads/1/3/1/6/131606268/d6240f.pdf
    • http://files.umrcsalem.org/uploads/1/3/1/0/131070485/zolika-ludub-jisoveso.pdf
    • http://files.mythicfirecreations.com/uploads/1/3/1/4/131437657/sulis.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/xigiwijilow.pdf
    • https://cdn.shopify.com/s/files/1/0438/2385/7824/files/37313595027.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/brother_p-_touch_label_maker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0450/files/79026897242.pdf
    • https://cdn.shopify.com/s/files/1/0431/7138/1405/files/34628780531.pdf
    • https://cdn.shopify.com/s/files/1/0438/2405/4429/files/78691546542.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7520/files/zajitepekotem.pdf
    • https://cdn.shopify.com/s/files/1/0434/4912/2983/files/97859734917.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/9028374383.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/72466744118.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/48759571808.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/daxurabafatix.pdf
    • https://cdn.shopify.com/s/files/1/0429/7107/0617/files/16984289254.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_off0000a233.bin
448979a7a6175797e061abb9b45a2e1cd47b73154e75e2ec27f6df1e807d7c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA233 5424 bytes
font_01_sfnt_off0000b493.bin
7235d7b97c88d55e96975f927c5a8ba4584be21c76d747d3991b3277e2d39750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB493 10380 bytes

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