Malicious PDF — malware analysis report

Static analysis result for SHA-256 0471528f0ba6016b…

MALICIOUS

PDF

34.9 KB Created: 2020-08-17 13:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 362bfc4d0bec8c234818c4cca6022c6e SHA-1: 3eb26d564be36c724bc0634dae962898e2475648 SHA-256: 0471528f0ba6016bbb1ce6d608864606ca40b13fb8f72483a69338fe2d443083
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, specifically for containing a large number of external links, many of which point to redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to potentially harmful content or participate in link farming.

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=avneet+kaur+photos
    • http://rodur.toadsandtulips.com/uploads/1/3/1/3/131383483/8494441.pdf
    • http://files.wavehogsurfshop.com/uploads/1/3/1/4/131407227/5606148.pdf
    • http://files.ohsing.com/uploads/1/3/1/3/131380612/toxasefanaregeki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/6238920383.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/36463178952.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/koteborisuzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/tavidotajoxuzogiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/ioptron_skyguider_pro_ebay.pdf
    • https://cdn.shopify.com/s/files/1/0439/4316/6107/files/somopopujejuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/how_to_install_cydia_without_jailbreaking.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/75508668097.pdf
    • https://cdn.shopify.com/s/files/1/0437/9577/5650/files/wopavavodebizizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6647/4139/files/xatotogipopakepef.pdf
    • https://cdn.shopify.com/s/files/1/0439/3543/2859/files/bufisisuromi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/tekuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1871/files/90764821337.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c8c.bin
6b788b1b1aadc66eddbc773064b5fbb0b4541970d390e00e06107b706bd41675
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8C 4988 bytes
font_01_sfnt_off00005d7b.bin
3eccee7c6ae08365783728c8ab290cb526f07ea16ef62bfac4911191f2052315
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7B 9772 bytes