Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fc53e7ae8a9119…

MALICIOUS

PDF

47.3 KB Created: 2020-08-19 22:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24a405c5c1ab8a2d116bb7358dbe52a5 SHA-1: fb9d6acb536b5684adfe3e98725b4fcddc67ac46 SHA-256: c5fc53e7ae8a9119c0394a695dd79b8cba6069e0683cb4c1895b1195229975b6
154 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 link farm hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=wifi+calling+on+android+7.+0, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the topic 'Wifi calling on android 7.0', likely a lure to entice users to click the malicious links. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or redirection attack.

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=wifi+calling+on+android+7.+0
    • http://gefanidu.thegreenerssound.org.hk/uploads/1/3/1/3/131384201/wurifopajejujonekevu.pdf
    • http://xegejude.wessexmaternityacademy.org/uploads/1/3/1/4/131437657/zoxodoke.pdf
    • http://voguxevi.kingsbaysilverandgoldauction.org/uploads/1/3/0/8/130874601/tawomefub.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/53663969609.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9267/files/kexubuxoza.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5711/files/3038879420.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/sync_files_to_sd_card_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7557/files/zopora.pdf
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/45303913324.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/28403767568.pdf
    • https://cdn.shopify.com/s/files/1/0433/1565/8920/files/32362504586.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0474/files/tawupesutabukevofab.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/filerasizupadoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/4407/7722/files/zupej.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/belgium_visa_application_form_for_short_stay.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/sidepuzetamibowovimi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/42825714947.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_off00007998.bin
381670fb0c7f12c76f7830fb743f9872c7c3b5a209ab3b732934ffe794843d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7998 5280 bytes
font_01_sfnt_off00008ba9.bin
b6aea69ef5ebe3a9d51db8ad90ec62005b75cde122d4747b882c8106ef63ea86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA9 10684 bytes

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