Malicious PDF — malware analysis report

Static analysis result for SHA-256 981bc4d251b0c034…

MALICIOUS

PDF

43.8 KB Created: 2020-08-22 00:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e8aee13427bcb6c4a648ab1e40dc498 SHA-1: 3e751ca417503b7b3e175d60a069deec7a8421fe SHA-256: 981bc4d251b0c03405e7c144502a72f56067f8be0b70750678a1fe387e74f93c
150 Risk Score

Malware Insights

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

This PDF file contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.ru/pify?keyword=addition+concepts+grade+1+worksheets'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link 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.ru/pify?keyword=addition+concepts+grade+1+worksheets
    • http://zedibifu.millwoodchurchofchrist.com/uploads/1/3/1/1/131164250/740b33657adef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/cross_reference_data_in_excel_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/fanafinegisapiteduve.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/80948645337.pdf
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/12779571848.pdf
    • https://cdn.shopify.com/s/files/1/0444/4035/4982/files/evernote_premium_annotation.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/adp_time_saver.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/algebra_1_regents_practice.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/5156517784.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/88519514883.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91025233068.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/nutuxosizejixidefixojagep.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_off00005f51.bin
180092493071cb9937d684f7bbe7d9244bf1a3041d7fccc73bfee60dc8dd4de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F51 5288 bytes
font_01_sfnt_off00007151.bin
a50b6c0c4436d1637b8caad0d97ab8393c74174bdbc6fbfe8ab70504394b64eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7151 10176 bytes
font_02_sfnt_off00009434.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9434 4324 bytes

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