Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a74a6f22e70326…

MALICIOUS

PDF

46.2 KB Created: 2020-08-07 13:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee16d82dbd06c440bd2bd58220a656e1 SHA-1: c573b6741961726ffbbeb6d0caff32f54611690b SHA-256: 85a74a6f22e7032683f7ef4ea3a294ff86ad79aedf3c64948af719696c69d3de
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=blind+side+pdf+download'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary malicious URL and a benign-looking URL, suggesting a lure to download or view content.

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.cc/pify?keyword=blind+side+pdf+download
    • http://files.charlotteponyclub.com/uploads/1/3/1/0/131069987/tilafowenes.pdf
    • http://files.ecsolutionsph.com/uploads/1/3/2/7/132710743/fifawo.pdf
    • http://files.sharonhalfordskintherapy.com/uploads/1/3/1/3/131384281/2985025.pdf
    • http://peguv.stephanieruthkane.com/uploads/1/3/0/7/130740025/7092107.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/5918725722.pdf
    • https://cdn.shopify.com/s/files/1/0428/5693/9676/files/el_mundo_fragmentado_cornelius_castoriadis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/72606709680.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/lujewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/jomamonuvorimuvikutuxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/jurnal_anti_jamur.pdf
    • https://cdn.shopify.com/s/files/1/0428/7663/3247/files/berichtsheft_vorlage_ihk_bayern.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/muwilojizoxosamefunonef.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/nesevibax.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/barefota.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/aiims_biology_chapterwise_questions.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_off000069f6.bin
29e02f0682a1b55071324c85ca0c1bc6757d314c105c09ff0f5920c6961dd999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F6 4788 bytes
font_01_sfnt_off00007a56.bin
84b469e77bdc28f9abfc1d78208ae4691ba9a22c67421096ee6b00876cf337dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A56 10432 bytes
font_02_sfnt_off00009def.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DEF 4324 bytes

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