Malicious PDF — malware analysis report

Static analysis result for SHA-256 da75f6fdfaaddda5…

MALICIOUS

PDF

41.0 KB Created: 2020-07-08 15:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1cc4f485e08b08a539ad1dd36de0ad SHA-1: 09650d1746e5733caad739666b22b9cd51ceed1c SHA-256: da75f6fdfaaddda5bac5f745f6df25f7d6632a070282311035d26c3e9cff63e2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wb?keyword=og%2027%20din%202002%20actualizata%202017%20pdf'. The ML classifier also strongly indicated maliciousness. The document body itself is largely obfuscated but contains similar redirector patterns.

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.com/wb?keyword=og%2027%20din%202002%20actualizata%202017%20pdf
    • http://files.saikmusic.org/uploads/1/3/2/7/132740415/67c8893d65fe7.pdf
    • http://files.bridgestoserbia.com/uploads/1/3/1/4/131452991/7654863.pdf
    • http://files.bombayfrankiecompany.com/uploads/1/3/1/8/131856518/232247.pdf
    • http://files.farmacybotanical.com/uploads/1/3/2/3/132302973/xutitogesafa-lixoreriberexik-larowuwonubola.pdf
    • http://files.bbawakeblogs.com/uploads/1/3/1/4/131437268/66807.pdf
    • http://files.storybookdelivery.com/uploads/1/3/1/4/131407823/7370618.pdf
    • http://files.ejacts.com/uploads/1/3/1/3/131384018/givebivusunilujogoj.pdf
    • http://files.winterwislib.org/uploads/1/3/0/7/130775752/pujofevawatig-zazamib.pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • http://files.befreecounselling.com/uploads/1/3/1/0/131070523/sijevagazuvidawafi.pdf
    • http://files.hsc3knives.com/uploads/1/3/0/9/130969243/a00465f049b.pdf
    • https://litafugasizu.files.wordpress.com/2020/06/nafel.pdf
    • https://vomibomuso593992328.files.wordpress.com/2020/06/93339697459.pdf
    • https://pasodota.files.wordpress.com/2020/07/kawusazetowojamasofape.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_off00006152.bin
8447262c25624fa1d280af702753643cf1ffbf1430d78e8c2c88e80047a52096
pdf-font-stream PDF embedded font (sfnt) at offset 0x6152 5184 bytes
font_01_sfnt_off00007320.bin
8f388ada0dc08c68e320548286da4ff6539ce5cd8cc913b02ca51a91a5fdc4e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7320 10952 bytes