Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b3992b53230c96…

MALICIOUS

PDF

50.7 KB Created: 2020-08-06 05:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d365c94217876bed0f1a064074adc300 SHA-1: 432e2e00c99ecf7594640bca6e99b86a2006a298 SHA-256: 26b3992b53230c96a11cb31d0819c976619ac3af10da9aa4d936744608df2454
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click through these links, which likely lead to malicious content or further exploitation. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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=bergman+spaces+pdf
    • http://pitobema.getmorelocalreferrals.com/uploads/1/3/1/8/131856318/4c8940e6fe6a1.pdf
    • http://files.kinobykimie.com/uploads/1/3/0/9/130969655/gokazisuwed-puteras-putag-bapomogeropefum.pdf
    • http://files.pelsonfamily.com/uploads/1/3/1/4/131408204/kitaful-fofawudeguzofu.pdf
    • http://files.emsteps.com/uploads/1/3/1/6/131637055/dujadebewagif_nokesugij_zegosasera.pdf
    • http://files.magicappleschool.net/uploads/1/3/1/0/131070497/tofitulanagonovew.pdf
    • https://cdn.shopify.com/s/files/1/0428/7663/3247/files/epidemiology_and_biostatistics_secrets.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/jevejazijuximututev.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/61603374114.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/xidikoxivewiwafakofut.pdf
    • https://cdn.shopify.com/s/files/1/0432/6116/5723/files/12832092493.pdf
    • https://cdn.shopify.com/s/files/1/0439/5125/9803/files/federal_cassation_decision_volume_20.pdf
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/66210876808.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/murofedurakerufixerujiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/14813742736.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/micro_center_richardson.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/89007190733.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/23824465910.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4245/files/10907565971.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_off000064a5.bin
392c959caaef96a1a00a76c30ee7403b2ab1176619dd704d6f17868ba9e3f5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A5 5492 bytes
font_01_sfnt_off00007741.bin
794a8e678a3f6611d81734f3ad887b9bb86a33c9853b6238eea4f9e4f9e1f63f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7741 15644 bytes
font_02_sfnt_off0000a89a.bin
5622e762d53f30b14100a2a374ee15f1a05b90206467a1c3c5852ff741d95b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA89A 16192 bytes

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