Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a05236b4a8a80fb…

MALICIOUS

PDF

32.9 KB Created: 2020-08-25 14:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b71dd08ef2de98fd7b00d91eff7ac381 SHA-1: fa068101ed1d827522c297a2707546e62058afae SHA-256: 5a05236b4a8a80fb2d5744cbc53dabf7950b13646e7b8f23bb908df9c39a1153
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at "ttraff.com". The document body, though heavily obfuscated, contains the text "York yk chiller log sheet" and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be a malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=york+yk+chiller+log+sheet
    • http://files.srpconsultinggroup.org/uploads/1/3/0/7/130739919/rufakitod.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/jogos_ppsspp_pelo_mega.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/zafedixebutavodeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/ramadan_calendar_2020_multan.pdf
    • https://cdn.shopify.com/s/files/1/0433/7057/8070/files/77872473331.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5262/files/99765506132.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/55668733002.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/nutagelixax.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/38305528404.pdf
    • https://cdn.shopify.com/s/files/1/0433/6920/1832/files/wubezivigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/viluragogiduf.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/19305074453.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/42274024544.pdf
    • https://cdn.shopify.com/s/files/1/0435/9657/8979/files/bokivilibarodokitix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/2334984707.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_off000043a0.bin
dcfee85df590b52c8bd89d30a4c873d9755ee159c8fc4004789b616f01616fa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43A0 4980 bytes
font_01_sfnt_off00005498.bin
080feab37811700620d30d1f402f377c66bf392a8ff677af2361a01b43547269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5498 10084 bytes

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